WebUI overhaul and source configuration

Server: v0.5.0 + WebUI: r789

TL;DR

• You can now install APK extensions from the extensions page
• WebUI now comes with an updated Material Design looks and is faster a little bit.
• WebUI now shows Nsfw content by default, disable it in settings if you prefer to not see Nsfw stuff
• Added support for configuration of sources, this enables MangaDex, Komga, Cubari and many other sources
• Chapters in the Manga page and Sources in the source page now look nicer and will glow with mouse hover

Tachidesk-Server

Public API

Non-breaking changes

• (r888) add installing APK from external sources endpoint

Breaking changes

• (r877 #188 by @Syer10) MangaDataClass.genre changed type to List<String>

Bug fixes

• (r899-r901) fix when an external apk is installed and it doesn't have the default tachiyomi-extensions name
• (r905) fix a bug where if two sources return the same URL, a false duplicate might be detected

Private API

• (r887) the run task won't call downloadWebUI now
• (r902) cleanup print/ln instances
• (r906) better handling of uninstalling Extensions

Tachidesk-WebUI

Visible changes

• (r770) add support for the new genre type
• (r771) set the default value of showNsfw to true so we won't have visual artifacts with a clean install
• (r774 #21 by @voltrare) ReaderNavbar.jsx: Swap close and retract Navbar buttons
• (r775 #23 by @voltrare) yarn.lock: Fixes version inconsistency after commit 9b866811b
• (r776 #23 by @voltrare) add margin between Source and Extension cards, make the Search button look nicer
• (r777) add support for installing external APK files
• (r778) fix the makeToaster?
• (r779) Action button for installing external extension
• (r780 Suwayomi/Suwayomi-WebUI#25) add on hover, active effect to Chapter/Episode card
• (r782-r785) updating material-ui to v5 changed the theme
• (r785-r788) better SourceCard looks on mobile, move SourceDataClass.isConfigurable gear button to SourceMangas
• (r789) implement source configuration

Bug fixes

• N/A

Internal changes

• (r782-r785) update dependencies, migrate material-ui from v4 to v5