feat(imgix): additional documentation and modifiers

[daletom]

Added a complete list of imgix modifiers, mapped to the KeyMap, as well as improving documentation to include examples and best practices

[codecov-commenter]

Codecov Report

Merging #316 (5181337) into main (654a6e9) will decrease coverage by 44.47%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #316       +/-   ##
===========================================
- Coverage   59.09%   14.61%   -44.48%     
===========================================
  Files          25       23        -2     
  Lines         594      527       -67     
  Branches      178      159       -19     
===========================================
- Hits          351       77      -274     
- Misses        243      448      +205     
- Partials        0        2        +2     

Impacted Files	Coverage Δ
src/runtime/providers/imgix.ts	0.00% <ø> (-100.00%)	⬇️
src/runtime/providers/fastly.ts	0.00% <0.00%> (-100.00%)	⬇️
src/runtime/providers/static.ts	0.00% <0.00%> (-100.00%)	⬇️
src/runtime/providers/prismic.ts	0.00% <0.00%> (-85.72%)	⬇️
src/runtime/providers/ipx.ts	0.00% <0.00%> (-84.62%)	⬇️
src/runtime/components/image.mixin.ts	0.00% <0.00%> (-81.82%)	⬇️
src/runtime/providers/cloudinary.ts	0.00% <0.00%> (-80.96%)	⬇️
src/runtime/providers/netlify.ts	0.00% <0.00%> (-77.78%)	⬇️
src/runtime/providers/twicpics.ts	0.00% <0.00%> (-72.23%)	⬇️
... and 8 more

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