Greasy Fork

1. Updated styling to match native site style:
   • Search input now shares look & feel of site search field.
   • Colors are no longer hardcoded, and instead come from the site light/dark theme.
   • Search input now fills width of page section so it feels more at-home in the layout.
2. Label text reduced, and moved instructive text to placeholder.
3. Added "(Secret)" tags to the description text that's searched.

Updated to reflect some site layout changes.

Previously, DLC section headers would continue to be shown even if no achievements under those headers matched the filter. Now these section headers are properly hidden.