docs: VPP IPsec remove lcp and netlink configuration (#2243)

* docs: vpp: remove netlink and lcp IPsec options

Removed netlink and lcp options from the VPP IPsec documentation
(dataplane/ipsec.md) as they were removed from the CLI.

Also updated the IPsec configuration page (vpp/configuration/ipsec.md):
- Clarified that the IPsec option can be configured in the VPP
  configuration section
- Removed the netlink rx-buffer-size and lcp ignore-kernel-routes
  options from the configuration example

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* docs: vpp: fix wording and broken anchor after netlink removal

- Restore "VPN configuration section" wording (was accidentally changed
  to "VPP configuration section", which contradicts the linked page and
  the fact that IPsec tunnels are configured via the ordinary vpn ipsec
  tree, not a VPP-specific section).
- Fix broken anchor in the "disable the kernel routes synchronization"
  link: lcp.md's real anchor is vpp_config_dataplane_lcp_ignore_kernel_routes,
  not vpp-lcp-configuration.
- Remove leftover blank line left after deleting the netlink section.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* docs: vpp: fix lcp.md link path and wrap long line

- The link target anchor lives in docs/vpp/configuration/dataplane/lcp.md,
  not a sibling docs/vpp/configuration/lcp.md, so the relative path needs
  the dataplane/ prefix.
- Convert to a shortcut reference link to keep the visible line under the
  80-character doc-lint limit; the long URL moves to a reference
  definition at the bottom of the file, suppressed with
  stop/start_vyoslinter per the documented convention for unavoidably
  long lines.

Verified locally with `python3 scripts/doc-linter.py
'["docs/vpp/configuration/ipsec.md"]'` (exit 0, no warnings).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* add ignore-kernel-routes.md

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Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

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