Update `README.md`

[its-miroma]

I'm creating a new PR to fix the problems with the linter from #812.

Preview at https://github.com/its-miroma/fo/tree/readme

• [x] Add right-aligned FO icon
• [x] Add Table of Contents
• [x] Change "Launcher Comparison" table
  • [x] Flip rows and columns, because items (Launchers) are usually placed as rows, plus if hypothetically there was a new one that would give a one-line diff
  • [x] Remove "Can be used offline" column, because all launchers support that, and specified that above
  • [x] Remove "Windows, macOS, Linux support" column, for the same reason
  • [x] Remove "Unique feature" column, because I think FO, and especially this README.md, is not the right place to see which features launchers have
  • [ ] Place the table in a collapsible block
  • [ ] Add launcher icons?
• [x] Add "Resource Packs" section, with links to download them.
• [x] Add "Contribute" section, linking to https://download.fo/thanks
• [x] Merge CREDITS.md into "Credits" section
• [x] Merge Resource Packs/README.md into "Resource Packs" section
• [x] Use reference links which help readability of the source file and make it more maintainable
• [x] Add badges
  • [x] Enable Discord widget
• [ ] Move INCLUDED-MODS.md to the wiki?
• [x] Add MultiMC auto update information
  • [ ] Move MultiMC auto update to the wiki?
• [ ] Update DEVELOPER-README.md
  • [ ] Perhaps move to CONTRIBUTING.md?
  • [ ] Add link to "Contributing" section in README.md
  • [ ] Add link to CODE_OF_CONDUCT.md in CONTRIBUTING.md
  • [ ] Add link to CODE_OF_CONDUCT.md to the wiki?

[its-miroma]

I added the badges, using shields.io, but to add custom icons I had to embed a data URI, which is a little ugly in the source code.

I used the flat style, but if you prefer, shields.io also supports the for-the-badge style.

There's also a problem with the Discord badge, because the server widget is not enabled in the FO server.

I also re-added the MultiMC download links.

[Madis0]

Is there a distinct icon for light/dark mode?

No.

Update DEVELOPER-README.md Perhaps move to CONTRIBUTING.md?

Maybe... Right now the contributing page highlights things that can be done by most users, while developer-readme is for specifically those who fork FO. Therefore I am not sure those should be mixed, as the target audiences are different.

[its-miroma]

I forgot to ask: title, icon and badges can be centered in the page, so which style do you prefer:

• https://github.com/its-miroma/fo/tree/readme (current)
• https://github.com/its-miroma/fo/tree/readme-alt (centered)

[Madis0]

I forgot to ask: title, icon and badges can be centered in the page, so which style do you prefer:

* https://github.com/its-miroma/fo/tree/readme (current)

* https://github.com/its-miroma/fo/tree/readme-alt (centered)

I prefer the centered one.