Rename the default themes to gitea-light, gitea-dark, gitea-auto (#27419)

Part of https://github.com/go-gitea/gitea/issues/27097:

- `gitea` theme is renamed to `gitea-light`
- `arc-green` theme is renamed to `gitea-dark`
- `auto` theme is renamed to `gitea-auto`

I put both themes in separate CSS files, removing all colors from the
base CSS. Existing users will be migrated to the new theme names. The
dark theme recolor will follow in a separate PR.

## ⚠️ BREAKING ⚠️

1. If there are existing custom themes with the names `gitea-light` or
`gitea-dark`, rename them before this upgrade and update the `theme`
column in the `user` table for each affected user.
2. The theme in `<html>` has moved from `class="theme-name"` to
`data-theme="name"`, existing customizations that depend on should be
updated.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>
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silverwind 2023-10-06 09:46:36 +02:00 committed by GitHub
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@ -370,7 +370,8 @@ A full list of supported emoji's is at [emoji list](https://gitea.com/gitea/gite
## Customizing the look of Gitea
The default built-in themes are `gitea` (light), `arc-green` (dark), and `auto` (chooses light or dark depending on operating system settings).
The built-in themes are `gitea-light`, `gitea-dark`, and `gitea-auto` (which automatically adapts to OS settings).
The default theme can be changed via `DEFAULT_THEME` in the [ui](administration/config-cheat-sheet.md#ui-ui) section of `app.ini`.
Gitea also has support for user themes, which means every user can select which theme should be used.
@ -384,7 +385,7 @@ To make a custom theme available to all users:
Community themes are listed in [gitea/awesome-gitea#themes](https://gitea.com/gitea/awesome-gitea#themes).
The `arc-green` theme source can be found [here](https://github.com/go-gitea/gitea/blob/main/web_src/css/themes/theme-arc-green.css).
The default theme sources can be found [here](https://github.com/go-gitea/gitea/blob/main/web_src/css/themes).
If your custom theme is considered a dark theme, set the global css variable `--is-dark-theme` to `true`.
This allows Gitea to adjust the Monaco code editor's theme accordingly.