Website fixes for mobile (#8857)
* better header for mobile
* add changeset
* nicer border
* style header
* better search overlay
* responsive changes
* more mobile responsiveness
* docs and guides mobile responsive
* formatting
* fix get started button
* fix header
* test without lite
* formatting
* secondary menu docs
* fix type overflow in paramtable
* playground header
* playground on mobile
* small changes
* formatting
* formatting
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
