Revert "Add incremental RST-to-MyST swap mechanism (sagitta) (#1868)" (#1894)

This reverts commit 22e34ce5aee24d2fd11f8205522ab7ecdb3c4c5e.

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diff --git a/docs/introducing/md-about.md b/docs/introducing/md-about.md
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-# About
-
-VyOS is an open source network operating system based on Debian GNU/Linux.
-
-VyOS provides a free routing platform that competes directly with other
-commercially available solutions from well known network providers. Because
-VyOS runs on standard amd64, i586 and ARM systems, it is able to be used
-as a router and firewall platform for cloud deployments.
-
-We use multiple live versions of our manual, hosted thankfully by
-<https://readthedocs.org>. We will provide one version of the manual for every
-VyOS major version starting with VyOS 1.2 which will receive Long-term support
-(LTS).
-
-The manual version is selected/specified by it's Git branch name. You can
-switch between versions of the documentation by selecting the appropriate
-branch on the bottom left corner.
-
-VyOS CLI syntax may change between major (and sometimes minor) versions. Please
-always refer to the documentation matching your current, running installation.
-If a change in the CLI is required, VyOS will ship a so called migration script
-which will take care of adjusting the syntax. No action needs to be taken by
-you.
diff --git a/docs/introducing/md-history.md b/docs/introducing/md-history.md
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-# History
-
-## In the beginning...
-
-There once was a network operating system based on Debian GNU/Linux,
-called Vyatta.[1] 2006 onwards, it was a great free software
-alternative to Cisco IOS and Jupiter JUNOS. It came in two editions:
-Vyatta Core (previously Vyatta Community Edition) that was completely
-free software, and Vyatta Subscription Edition that had proprietary
-features and was only available to paying customers.[2]
-
-Vyatta was acquired by Brocade Communication Systems in 2012. Shortly
-after, Brocade renamed Vyatta Subscription Edition to Brocade vRouter,
-discontinued Vyatta Core and shut down the community forum without a
-notice. The bug tracker and Git repositories followed next year.
-
-It's worth noting that by the time Brocade acquired Vyatta,
-development of Vyatta Core was already stagnated. Vyatta Subscription
-Edition (and thus, Vyatta development as a whole) had been replacing
-core components with proprietary software, meaning few features made
-it to Vyatta Core, and those that did were bug-ridden and hamstrung.
-
-In 2013, soon after Vyatta Core was abandoned, the community forked
-the last Vyatta Core version (6.6R1) and VyOS Project came into being.
-[Sentrium SL](https://blog.vyos.io/sentrium-what-sentrium) was
-established by VyOS maintainers in 2014 to fund VyOS development by
-selling support, consulting services and prebuilt long-term support
-images.
-
-Brocade was acquired by Broadcom in 2016 and sold what remains of
-erstwhile Vyatta to AT&T in 2017, who in turn sold it to Ciena in 2021.
-
-## Major releases
-
-VyOS major versions used to be named after elements in order of atomic
-numbers. With 1.2, this naming scheme was replaced with the much
-cooler scheme of Latin names of [IAU](https://en.wikipedia.org/wiki/IAU_designated_constellations_by_area)
-designated constellations by solid angle area, starting from the smallest.
-
-### Hydrogen (1.0)
-
-Released just in time for holidays on 22 December 2013, Hydrogen was
-the first major VyOS release. It fixed features that were broken in
-Vyatta Core 6.6 (such as IPv4 BGP peer groups and DHCPv6 relay) and
-introduced command scripting, a task scheduler and web proxy LDAP
-authentication.
-
-### Helium (1.1)
-
-Helium was released on 9 October 2014, exactly on the day VyOS Project
-first came into being in the previous year. Helium came with a lot of
-new features, including an event handler and support for L2TPv3,
-802.1ad QinQ and IGMP proxy, as well as experimental support for VXLAN
-and DMVPN (the latter of which was also broken in Vyatta Core due to
-its reliance on a proprietary NHRP implementation).
-
-### Crux (1.2)
-
-Crux (the Southern Cross) came out on 28 January 2019 and was the
-first major release of VyOS as we know it today. The underlying
-Debian base was upgraded from Squeeze (6) to Jessie (8).
-
-Although Crux came with too many new features to mention here, some
-noteworthy ones are: an mDNS repeater, a broadcast relay,
-a high-performance PPPoE server, an HFSC scheduler, as well as support
-for Wireguard, unicast VRRP, RPKI for BGP and fully 802.1ad-compliant
-QinQ ethertype. The telnet server and support for P2P filtering were
-removed.
-
-Crux is the first version to feature the modular image build system.
-CLI definitions began to be written in the modern, verifiable XML
-templates. Python APIs were introduced for command scripting and
-configuration migration. Introduction of new Perl and shell code was
-proscribed and the rewriting of legacy Perl code in pure Python began
-with Crux.
-
-As of 2022, Crux is still supported and maintained.
-
-### Equuleus (1.3)
-
-The current long-term support version of VyOS, Equuleus (the Pony)
-came out on 21 December 2021, once again in time for the winter
-holidays.
-
-Equuleus brought many long-desired features with it, most notably
-an SSTP VPN server, an IPoE server, an OpenConnect VPN server and
-a serial console server, in addition to reworked support for WWAN
-interfaces, support for GENEVE and MACSec interfaces, VRF, IS-IS
-routing, preliminary support for MPLS and LDP, and many other
-initialisms.
-
-As of 2022, Equuleus is in the stable.
-
-### Sagitta (1.4)
-
-Sagitta (the Arrow) is the codename of the current development
-branch, so there's no VyOS 1.4 yet.
-
-### Circinus (1.5)
-
-Circinus (the Compass) is the codename of the upcoming development
-branch, so there's no VyOS 1.5 yet.
-
-## A note on copyright
-
-Unlike Vyatta, VyOS never had (nor will ever have) proprietary code.
-The only proprietary material in VyOS is non-code assets, such as
-graphics and the trademark "VyOS".[3] This means you can build your
-own long-term support images (as the entire toolchain we use is free
-software) and even distribute them, given you rename it and remove
-such assets before building. Although note that we do not provide
-support for images distributed by a third-party. See the
-[artwork license](https://github.com/vyos/vyos-build/blob/current/LICENSE.artwork)
-and the end-user license agreement at `/usr/share/vyos/EULA` in
-any pre-built image for more precise information.
-
-[1] From the Sanskrit adjective "Vyātta" (व्यात्त), meaning opened.
-
-[2] A business model comparable to that of Redis, rather than that
-of VyOS today.
-
-[3] This is not unlike how Linus Torvalds owns the trademark "Linux".