feat: search on small screens

[patak-dev]

Fixes #545
Fixes #546

Description

• Adds Search icon on mobile, and removes explore and local (moved to ...)
• Adds /search route
• For md screens, once the right sidebar is collapsed, replace the explore icon in the left sidebar with search
• Avoid "Search Elk", just use "Search" as the placeholder

This is following the UI of twitter which also seems to work quite well for Mastodon.

@LittleSound is working on embedding the search widget on the command palette here:

• feat: search in command panel #576

This PR temporarily adds the search widget from the right sidebar as is in the new /search route. @LittleSound once we merge your PR, could you also use your new widget for this route if it is a good fit?

cc @TodePond

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