Documentation restructure

[srivarra]

• 📝 Updated documentation structure
• 📝 Updated landing page

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.22%. Comparing base (7435d65) to head (59e906a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   86.52%   94.22%   +7.70%     
==========================================
  Files          13       13              
  Lines         319      329      +10     
==========================================
+ Hits          276      310      +34     
+ Misses         43       19      -24     

Files with missing lines	Coverage Δ
src/annsel/core/methods.py	79.59% <100.00%> (ø)
src/annsel/core/typing.py	100.00% <100.00%> (ø)
src/annsel/core/utils.py	96.72% <100.00%> (+23.03%)	⬆️
src/annsel/datasets/basic.py	100.00% <ø> (ø)
src/annsel/tl/_filter.py	100.00% <100.00%> (+6.25%)	⬆️
src/annsel/tl/basic.py	93.33% <100.00%> (+25.47%)	⬆️