docs: added devstral to llms list, added local llms in local setup

[llamantino]

• [ ] This change is worth documenting at https://docs.all-hands.dev/
• [ ] Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

End-user friendly description of the problem this fixes or functionality this introduces.

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Summarize what the PR does, explaining any non-trivial design decisions.

1. Added devstral in the llms list page and split the section in cloud/local
2. Added a reference to the local llms page in the local setup page

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Link of any specific issues this addresses:

[mamoodi]

This looks good! Thank you for this PR!