feat: static target DX improvements

[pi0]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

• With 2.13 we were making errors to force using nuxt export and nuxt serve for static target. Now instead users can keep using nuxt generate and nuxt start
• export:* hooks deprecated to avoid using different names (generate will kept for nuxt3 too)
• exports option is deprecated
• Move smart build from nuxt/static to the core for nuxt generate for static target only (non breaking change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #7712 into dev will decrease coverage by 1.31%.
The diff coverage is 31.09%.

@@            Coverage Diff             @@
##              dev    #7712      +/-   ##
==========================================
- Coverage   70.13%   68.82%   -1.32%     
==========================================
  Files          88       90       +2     
  Lines        3764     3820      +56     
  Branches     1025     1034       +9     
==========================================
- Hits         2640     2629      -11     
- Misses        913      968      +55     
- Partials      211      223      +12     

Flag	Coverage Δ
#unittests	68.82% <31.09%> (-1.32%)	⬇️

Impacted Files	Coverage Δ
packages/cli/src/utils/generate.js	0.00% <0.00%> (ø)
packages/config/src/config/generate.js	100.00% <ø> (ø)
packages/core/src/nuxt.js	93.18% <ø> (ø)
packages/vue-app/src/index.js	100.00% <ø> (ø)
packages/cli/src/commands/generate.js	88.23% <50.00%> (-5.52%)	⬇️
packages/generator/src/generator.js	86.22% <62.50%> (+0.93%)	⬆️
packages/cli/src/utils/serve.js	70.37% <70.37%> (ø)
packages/cli/src/commands/build.js	89.65% <100.00%> (ø)
packages/cli/src/commands/export.js	100.00% <100.00%> (ø)
packages/cli/src/commands/serve.js	100.00% <100.00%> (+27.58%)	⬆️
... and 4 more

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[Atinux]

I need to update articles & docs now :)