Cleaner ui for admin, repo settings, and user settings page

[pgaskin]

Same as #1253 but for other pages. Also will made repo ui more responsive.

New look:

[pgaskin]

Requested by @bkcsoft : #1255 (comment)

\cc @bkcsoft @tboerger @strk

[pgaskin]

1. Move content and menu out of grid
2. Menu css: justify-content: center;padding-top: 15px;margin-top: -15px;margin-bottom: 15px;background-color: #FAFAFA;border-width: 1px;
3. Menu classes: ui secondary pointing tabular top attached borderless menu stackable navbar
4. Remove .header.item and move menu up above the container

And on the repo view, also add class stackable to the tabs too.

[pgaskin]

Also fixes a lot of issues for #35

[bkcsoft]

@geek1011 Now that I get to see the mobile version as well. Is there any way to make the navbar tabs a dropdown?

[pgaskin]

@bkcsoft Yes, and I'll do that in my next PR. Also, I need to add the meta responsive tags as soon as I finish a few more fixes.

[tboerger]

💯

[pgaskin]

#1270