Cherry pick Geo docs to 2.5

We need to cherry-pick the Geo docs to 2.5, so that they are available in the versioned docs.

See merge request !1041 (merged)

(cherry picked from commit 119f7bf3)

• d3710514 Geo: add documentation
• b45dd07b Geo: add documentation
• ae61208f Merge branch '1213-add-geo-support-docs' of gitlab.com:charts/gitlab into 1213-add-geo-support-docs
• eb8d2703 Geo: adding more docs, fix linting
• d99a6e0d Geo: complete initial setup docs
• ad899865 Geo: complete initial setup docs
• 02af64b1 Merge branch '1213-add-geo-support-docs' of gitlab.com:charts/gitlab into 1213-add-geo-support-docs
• e4d8fe2b Geo: docs, fix linting
• 133c5e34 Geo: docs note logcursor delayed until db config
• 59c97ac7 Apply suggestion to doc/advanced/geo/index.md
• 882eac65 Apply suggestion to doc/advanced/geo/index.md
• d301a89a Apply suggestion to doc/advanced/geo/index.md
• c39dafd1 Geo: docs - address included items in overview
• 68834ac3 Apply suggestion to doc/advanced/geo/index.md
• b41d0796 Apply suggestion to doc/advanced/geo/index.md
• 21165f17 Geo: docs - fixed per feedback
• 38465d9d Apply suggestion to doc/advanced/geo/index.md
• 586c1a59 Apply suggestion to doc/advanced/geo/index.md
• 658141a8 Geo: docs - replace node with instance
• 6eef9ba0 Geo: docs - re/move example files per feedback
• fcbbb8c1 Geo: docs - address doc linter failures
• 50a1da04 Geo: docs - update ref to why external db
• a0e6512d Apply suggestion to doc/advanced/geo/index.md
• ed883150 Apply suggestion to doc/advanced/geo/index.md
• a19bec71 Apply suggestion to doc/advanced/geo/index.md
• 396d4c9f Apply suggestion to doc/advanced/geo/index.md
• 795d08ab Apply suggestion to doc/advanced/geo/index.md
• 067bc496 Apply suggestion to doc/advanced/geo/index.md
• 217d4724 Apply suggestion to doc/advanced/geo/index.md
• 7c31232a Apply suggestion to doc/advanced/geo/index.md
• 568c3077 Apply suggestion to doc/advanced/geo/index.md
• 9954dc7a Apply suggestion to doc/advanced/geo/index.md
• 03577421 Apply suggestion to doc/advanced/geo/index.md
• 5def0aea Apply suggestion to doc/advanced/geo/index.md
• c474f2e2 Apply suggestion to doc/advanced/geo/index.md
• f6534266 Apply suggestion to doc/advanced/geo/index.md
• 3dd5fe74 Geo: docs update per feedback
• a60195a3 Apply suggestion to doc/advanced/geo/index.md