Fix and update WebLLM example

[MarcSkovMadsen]

Todo

• Update LLama model. Try the update here https://py.cafe/panel-org/webllm.
• Phillip: Fix wrong webllm link (WebLLM source code link not valid #7350)

I don't know how to fix the broken link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.20%. Comparing base (394d603) to head (d29724d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7351      +/-   ##
==========================================
+ Coverage   81.41%   82.20%   +0.79%     
==========================================
  Files         337      337              
  Lines       50513    50513              
==========================================
+ Hits        41125    41526     +401     
+ Misses       9388     8987     -401     

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[philippjfr]

Just lower case it.

[MarcSkovMadsen]

Just lower case it.

But where? I could not figure out where.

[philippjfr]

doc/gallery/index.md I think