docs(site): make version injection generic (versions.json-driven)

[bloxster]

Forward-ports the generic version-injection refactor (introduced on release/3.5 in #22062) to main, so every release branch cut from main inherits it.

Why on main

Release branches are cut from main. If this infra only lived on release/3.5, release/3.6 would revert to the old hardcoded per-series resolver. Pairs with the Docs Version Bump workflow (#22066), which also lives on main.

What changes

• Replaces the hardcoded fetchLatestV33Version / v33Version with a parametrized fetchLatestSeriesVersion(prefix) looped over versions.json, building a {id -> latest patch} map.
• The remark plugin routes by the version-vX.Y path segment instead of a hardcoded version-v3.3 check.
• Net effect: adding an archived version (via docusaurus docs:version) needs zero edits to docusaurus.config.ts or version-replace.js.

No behavior change here

versions.json is still ["v3.3"] and the current label is still v3.4 — verified the build injects 3.3.1 into the v3.3 archive and the latest release into current, exactly as before. This PR is purely the mechanism.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR forward-ports the docs-site “generic version injection” mechanism to main, so archived docs versions (from versions.json) automatically receive the correct {ERIGON_VERSION} replacement without adding per-series configuration.

Changes:

• Replaces the hardcoded archived-series resolver with a generic fetchLatestSeriesVersion(prefix) approach driven by versions.json.
• Updates the remark plugin to detect archived versions via the version-vX.Y path segment and select the corresponding injected version string.
• Passes a { archivedVersionId -> latestPatchString } map (versionStrings) into the remark plugin from docusaurus.config.ts.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/site/src/remark/version-replace.js	Switches archive detection from a hardcoded version-v3.3 check to generic version-* segment routing via versionStrings.
docs/site/docusaurus.config.ts	Derives archived version injection values from versions.json and passes them into the remark plugin.

Comments suppressed due to low confidence (1)

docs/site/docusaurus.config.ts:36

• fetchLatestSeriesVersion() fetches the full releases list for each archived version, which scales linearly with the number of archives and increases the chance of GitHub API rate-limiting during docs builds. It also limits the search to per_page=50, which can fail to find older series if they fall outside the first page. Consider fetching releases once (with per_page=100) and deriving all archived series versions from that single response.

async function fetchLatestSeriesVersion(prefix: string): Promise<string> {
  try {
    const res = await fetch(
      'https://api.github.com/repos/erigontech/erigon/releases?per_page=50',
      {headers: githubHeaders()},

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