Final Cleanup for 0.3 release

[haberdashPI]

This is a series of small, mostly cosmetic updates prior to the 0.3.0 release which will be the first release published to the VSCode/VSCodium 'stores'.

Updates:

• Many improvements to the README
• A shiny logo
• Rename Remove Keybindings to Deactivate Keybindings to match Activate Keybindings
• Activating user bindings has a default file equal to the currently active file
• Created an Install Active Keybinding Extensions command that lets users install extensions after activating keybindings without having to reactivate them.

FYI: @bhainesva: I have reverted your change to the shift+r command form #15 as I have found that in general it is more useful to have it not expand lines in my daily work. If you desire the behavior as it was previously documented you can always press shift+x shift+r, or override the default binding with a user binding, as made possible by #13

[codecov]

Codecov Report

Attention: Patch coverage is 48.00000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 83.49%. Comparing base (f64e88e) to head (06e02de).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/web/keybindings/index.ts	48.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   76.28%   83.49%   +7.21%     
==========================================
  Files          24       24              
  Lines        2315     2333      +18     
  Branches      465      470       +5     
==========================================
+ Hits         1766     1948     +182     
- Misses        371      380       +9     
+ Partials      178        5     -173     

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