Tauri sidecar README fixes and added open ai env variables

[shauryr]

Minor changes -

• Sidecar needs the openai env variables setup before someone can test the AI features using poetry
• minor formatting fixes: removed $ for easier copying of commands.

[codecov]

Codecov Report

Merging #337 (6db16ec) into main (adc02a8) will decrease coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
- Coverage   86.35%   86.08%   -0.28%     
==========================================
  Files         150       14     -136     
  Lines        8487      855    -7632     
  Branches      957        0     -957     
==========================================
- Hits         7329      736    -6593     
+ Misses       1147      119    -1028     
+ Partials       11        0      -11     

see 136 files with indirect coverage changes

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