12.2
contributor docs: Rename section and update references.
docs: Fix broken link for GitHub Actions job.
compose: Convert module to typescript.
docs: Update and add links to section on reading git history.
contributor docs: More guidance on explaining your PR vs. prior ones.
contributor docs: Document policy for non-code attributions.
docs: Revise docs on presenting screnshots.
contributor docs: Reorganize contributor guide.
docs: Better place screenshot tools.
docs: Add contributor guide page on licensing.
docs: Revise uses of "git-grep" to be "git grep" instead.
docs: Improve xrefs to screenshot guidance, tools.
contributor docs: Describe how to handle follow-ups.
docs: Restore lost link references on "reviewable prs" page.
docs: Update links to go to zulip-flutter instead of zulip-mobile.
docs: Fix many spelling mistakes.