docs: add favicon and mobile styling (#3650)

# What does this PR do?
* Adds favicon
* Replaces old llama-stack theme image 
* Adds some mobile styling

## Test Plan
* Manual testing
This commit is contained in:
Alexey Rybak 2025-10-02 01:42:54 -07:00 committed by GitHub
parent 267f658968
commit cb36b3bab1
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