feat: ipx production support

[danielroe]

• add documentation for manual runtime configuration
• add support for auto config with Nuxt 2.16+ and .nuxtrc (depends on feat(config): support nuxtrc in dist directory nuxt#9280)

TODO:

• only register ipx middleware if provider is static, ipx or empty?
• use relative paths

closes #196, closes #187

[codecov-commenter]

Codecov Report

Merging #257 (5ce97c9) into main (c7d4217) will increase coverage by 43.64%.
The diff coverage is 74.19%.

@@             Coverage Diff             @@
##             main     #257       +/-   ##
===========================================
+ Coverage   13.78%   57.43%   +43.64%     
===========================================
  Files          21       24        +3     
  Lines         457      545       +88     
  Branches      136      161       +25     
===========================================
+ Hits           63      313      +250     
+ Misses        392      232      -160     
+ Partials        2        0        -2     

Impacted Files	Coverage Δ
src/runtime/components/nuxt-img.vue	77.77% <ø> (ø)
src/runtime/components/nuxt-picture.vue	77.50% <ø> (ø)
src/runtime/image.ts	69.81% <ø> (+69.81%)	⬆️
src/runtime/ipx.ts	0.00% <0.00%> (ø)
src/runtime/providers/prismic.ts	85.71% <ø> (+85.71%)	⬆️
src/ipx.ts	72.00% <72.00%> (-28.00%)	⬇️
src/module.ts	96.42% <100.00%> (+3.32%)	⬆️
src/provider.ts	72.22% <100.00%> (+11.11%)	⬆️
... and 15 more

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[pi0]

One more note: In absence of image module (devDependencies) one needs installing ipx as a dependency! It is making me to think trade off of using normal module and depend on nitro for bundling (there is also fact that we cannot support non-node deployments like CloudFlare workers)