Raw file view tweaks (#15520)

- Limit SVG images to 600px width
- Adjust size of view toggle buttons to match other buttons
- Make Edit/Delete buttons easier to click

Had to create a separate CSS file because the less parser can not parse
CSS4 case-insensitive attribute selectors which are widely supported by
browsers.

Fixes: https://github.com/go-gitea/gitea/issues/15515

webpack.config.js

@@ -48,6 +48,7 @@ export default {
       resolve(__dirname, 'web_src/fomantic/build/semantic.js'),
       resolve(__dirname, 'web_src/js/index.js'),
       resolve(__dirname, 'web_src/fomantic/build/semantic.css'),
+      resolve(__dirname, 'web_src/less/misc.css'),
       resolve(__dirname, 'web_src/less/index.less'),
     ],
     swagger: [