10.3
web: Move web app to ‘web’ directory.
docs: Upgrade development environment page to use synced tabs.
docs: Convert .html#fragment links to .md#fragment.
docs: Format Markdown with Prettier.
docs: Convert reST index pages to Markdown.
docs: Update broken edX reference links
docs: Add comma to all uses of "e.g." in contributor docs.
docs: Display `main` branch name as inline code.
docs: Update the stale links in "Set up Git" docs.
docs: Fix many spelling mistakes.
lint: Fix several duplicate word typos.
docs: Clean redundant relative links.
documentation: Modify cases of "[a-zA-Z] e\.g\.," for readability.