docs: Finish 0.3.0 docs

[marc2332]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.88%. Comparing base (31a5e24) to head (e1b1bd6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/freya/src/launch.rs	0.00%	2 Missing ⚠️
crates/winit/src/config.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1105      +/-   ##
==========================================
- Coverage   74.89%   74.88%   -0.01%     
==========================================
  Files         231      231              
  Lines       28423    28425       +2     
==========================================
  Hits        21287    21287              
- Misses       7136     7138       +2     

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