Implement updated design notification banners

[liquidely]

This will apply the new design to all wikis!

In this PR:

• Applies new design to network notices (css/html) for all wikis.
• Removed the fields/use of Colors
• Added the JS from https://liquipedia.net/commons/MediaWiki:Common.js/SiteNotice.js so this file can be deleted

Closes ticket
Can be tested here

PR to remove SiteNotices.js Liquipedia/Lua-Modules#4249

[iMarbot]

You might already be aware, but if you're not, to fix the CI pipeline: Liquipedia/ResourceLoaderArticles@d23ef7c

[liquidely]

You might already be aware, but if you're not, to fix the CI pipeline: Liquipedia/ResourceLoaderArticles@d23ef7c

I didn't know yet, thanks a lot!

[FO-nTTaX]

We should probably add js stylechecking via eslint, we also should get a migration to remove the color (style) column from the database.

[liquidely]

We should probably add js stylechecking via eslint, we also should get a migration to remove the color (style) column from the database.

Added eslint

[iMarbot]

Suggestion for cleaner ESLint config using ES2020 instead.

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Also, I know there's no jQuery in this project, but if we ever wanted to use any, down the road, would be useful to add (then or now) it to package.json so that the jquery settings in the linter actually do something and to provide IDE syntax highlighting and static analysis.