docs: Migrate to Wiki

[Aeastr]

This PR migrates Wiki files to the proper GitHub Wiki, and adds the wiki as an accessible submodule to the repo

[Copilot]

Pull Request Overview

This PR migrates documentation from a local wiki directory to GitHub's native Wiki system by removing local wiki files and adding the official GitHub Wiki as a git submodule for easier access and maintenance.

Key changes:

• Removes all local wiki markdown files including sidebar, troubleshooting, releases, quick start, keyboard shortcuts, home page, hosting setup, and data persistence documentation
• Adds GitHub Wiki repository as a git submodule at browser.wiki
• Configures submodule to point to the official Wiki repository URL

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
wiki/_sidebar.md	Removes wiki sidebar navigation structure
wiki/TROUBLESHOOTING.md	Removes troubleshooting documentation
wiki/RELEASES_UPDATES.md	Removes release and update system documentation
wiki/QUICK_START.md	Removes quick start hosting setup guide
wiki/KEYBOARD_SHORTCUTS.md	Removes keyboard shortcuts reference
wiki/Home.md	Removes wiki home page
wiki/HOSTING_SETUP.md	Removes detailed hosting setup guide
wiki/DATA_PERSISTENCE.md	Removes data persistence documentation
browser.wiki	Adds GitHub Wiki as git submodule
.gitmodules	Configures submodule settings for the Wiki

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