Allow Gitea to have themes

[DblK]

Since we use semantic-ui and it can handle themes, Gitea should provide the default theme and a dark theme also.
Users will be able to make their own theme too.

I would suggest to begin with only css tweaks to change the display of pages.
In a second step, maybe we can add themes to modify templates file (.tmpl) to modify the links on each page.

What do you think about that?

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[joubertredrat]

@DblK your idea is only change color or html components too?

[DblK]

With Semantic you can do both (See http://semantic-ui.com/usage/theming.html).
The implementation could be simple, by looking to bindata and see if there are few themes inside a possible "themes" folder.
A list of theme could be selected from an admin page and/or adding option to each repo to set the default theme.

[joubertredrat]

theme with material design sounds good

[metalmatze]

I was actually thinking about a material theme too. I'd like to join the discussion here.
I really like https://getmdl.io. A new UI should probably wait for #64.

[xinity]

switched to enhancement as we agree on benefits of this idea :)

[gabrielsimoes]

I'm planning on tackling this issue (or at least #730) , and I thought about implementing a button close to the language button on the bottom of the page, which would be used to choose theming. Any thoughts on this?

[gabrielsimoes]

Does anybody suggest a way to pack themes? The css-only version of semantic-ui, which gitea uses, apparently is not made to support themes. Do you guys have any ideas on how to approach this?

[lunny]

I remember someone have provide a github-like theme.

[pgaskin]

Just pack the theme into a single CSS file, and apply it over the existing theme. It usually works fine.