docs: major docs improvements, transform tool examples to chat directives for docs

[ErikBjare]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.97297% with 10 lines in your changes missing coverage. Please review.

Project coverage is 76.59%. Comparing base (a63f1c5) to head (5c6668a).

Files	Patch %	Lines
gptme/tools/terminal.py	40.00%	6 Missing ⚠️
gptme/commands.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   78.10%   76.59%   -1.52%     
==========================================
  Files          32       32              
  Lines        2238     2264      +26     
==========================================
- Hits         1748     1734      -14     
- Misses        490      530      +40     

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