Reorganize various CSS files for clarity, group together by subdirectory in `index.css`. This reorders some of the rules, but I don't think it should introduce any issues because of that.
- Remove various horizontal dividers on repo pages that didn't provide visual benefit - Remove label/milestone pills on single issue/pr page - Remove issue-related pill buttons on projects page - Increase contrast of color-secondary on arc-green - Improve notifications icon, make circle bigger - Remove some inline styles - Fix focus in issue/pr title edit and select all text on button click ### Issue and PR before and after <img width="1249" alt="Screenshot 2023-05-01 at 11 44 22" src="https://user-images.githubusercontent.com/115237/235436662-a708288e-84fb-4b2e-a5a2-3a1c17d28f6c.png"> <img width="1248" alt="Screenshot 2023-05-01 at 11 58 51" src="https://user-images.githubusercontent.com/115237/235437992-f863e483-f3cc-4cc1-8204-fd223647a0c9.png"> ### Projects before and after <img width="1255" alt="Screenshot 2023-05-01 at 11 41 02" src="https://user-images.githubusercontent.com/115237/235436433-0deb85d6-4e7d-4e74-847f-254cc70a0cf9.png"> <img width="1267" alt="Screenshot 2023-05-01 at 11 40 03" src="https://user-images.githubusercontent.com/115237/235436431-715b13cb-f78c-4d86-b27a-9229f9738c5b.png"> ### Releases before and after <img width="1243" alt="Screenshot 2023-05-01 at 11 41 12" src="https://user-images.githubusercontent.com/115237/235436457-b655ee6f-03b8-4595-8d8c-b15ea469e988.png"> <img width="1240" alt="Screenshot 2023-05-01 at 11 40 10" src="https://user-images.githubusercontent.com/115237/235436456-05a2a0dd-7cbb-4f26-b0d3-4f667df4bb95.png"> ### Misc <img width="58" alt="Screenshot 2023-05-01 at 10 49 13" src="https://user-images.githubusercontent.com/115237/235432494-936ce995-6e22-47bc-ab2d-c9e93d31987d.png"> <img width="57" alt="Screenshot 2023-05-01 at 18 57 08" src="https://user-images.githubusercontent.com/115237/235492430-1d32cfe0-0f2c-467c-b2fa-925b27e30e0e.png"> Issue title edit and wrap: <img width="1238" alt="Screenshot 2023-05-01 at 12 34 40" src="https://user-images.githubusercontent.com/115237/235441407-d5067a57-e586-4865-a652-282e5944abb4.png"> <img width="1232" alt="Screenshot 2023-05-01 at 12 06 24" src="https://user-images.githubusercontent.com/115237/235438710-1a543dda-220f-4d87-8f93-f1710c0695f0.png"> --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
- Make search bar dynamic full width via flexbox - Make all buttons `small` so font size is the same for all elements in the header - Remove primary color from search field, add SVG icon like on Code tab - Fix button vertical padding being enlarged by SVG icons [View diff without whitespace](https://github.com/go-gitea/gitea/pull/24420/files?diff=unified&w=1) <img width="1226" alt="Screenshot 2023-04-29 at 11 58 53" src="https://user-images.githubusercontent.com/115237/235296851-74848267-664f-4c1f-b94c-a1b94196ff75.png"> <img width="1219" alt="Screenshot 2023-04-29 at 11 59 39" src="https://user-images.githubusercontent.com/115237/235296852-bcfde5ed-8658-43c2-b7e5-3ad84611e76f.png"> Mobile: <img width="437" alt="Screenshot 2023-04-29 at 11 59 52" src="https://user-images.githubusercontent.com/115237/235296860-99263373-7b27-4540-868c-a93e70f281ca.png"> <img width="433" alt="Screenshot 2023-04-29 at 12 00 00" src="https://user-images.githubusercontent.com/115237/235296862-6cf64317-a864-405a-a00f-b5ab620349f5.png">