3.x calendar and release information update

[AArdeev]

Product: Tarantool
Since: 3.x
Root document: https://www.tarantool.io/en/doc/latest/release/
SME: @ hackallcode

Details

Follow up to #5167

• Page https://www.tarantool.io/en/doc/latest/release/ .
  Keep only 3.x in "latest", move 2.x to "2.11".
Add reference from "latest" to "2.11".
• Table https://www.tarantool.io/en/doc/latest/release/#supported-versions.
  Separate data (keep 3.x in "latest", move 1.x & 2.x to "2.11").
• Page https://www.tarantool.io/en/doc/latest/release/eol_versions/.
  Remove anything older than 3.0.0 from the table (including legacy release policy) and delete the note before the table.
• Left menu of https://www.tarantool.io/en/doc/latest/release/eol_versions/.
  Move everything but Tarantool 3.0 & Tarantool 3.1 to "2.11".
• The "latest" contains Tarantool 3.0 and Tarantool 3.1 releases in 2 sections at the same time: "Releases" and "EOL Versions". Both releases must be either presented only in the "EOL versions" section or the very "EOL Versions" section must be removed. In the latter case, the EOL info should be either marked next to the version's name (Tarantool 3.0 EOL), or provided as an information (warning, note) box inside of the page.

To be doublechecked:

• Page Enterprise SDK Changelog in Latest has links to EOL versions that we want to remove. How to be with them?
• Prior to removing any non-3.x info, make sure that:
  a) Info exists in 2.11
  b) Info in 2.11 is identical to info in Latest
  c) If the info is not identical - find out which version is true and keep it in 2.11