fix!: prepend router base

[btkostner]

This fixes #338 but is a breaking change due to how URLs are handled.

If you have a default router base of /:
/images/test.png points to ~/static/images/test.png and outputs /_nuxt/image/hash.png in the HTML (no difference.)

If you have a router base of /app/:
/images/test.png points to ~/static/images/test.png and would output /app/_nuxt/image/hash.png in the HTML. This is different from the current implementation that would require you to do /app/images/test.png to generate correctly.

If you have a router base of /app/ with external url:
https://example.com/test.png points to an external URL and outputs /app/_nuxt/image/hash.png in the HTML.

Alternative way to do this

We could remove the changes in ipx.ts. Specifying the src for images would be the same as it is now, but it would resolve correctly after being built. This would not be a breaking change.

[codecov-commenter]

Codecov Report

Merging #339 (1dc311d) into main (58dd744) will decrease coverage by 0.09%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #339      +/-   ##
==========================================
- Coverage   58.81%   58.71%   -0.10%     
==========================================
  Files          26       26              
  Lines         607      608       +1     
  Branches      190      192       +2     
==========================================
  Hits          357      357              
- Misses        250      251       +1     

Impacted Files	Coverage Δ
src/generate.ts	3.44% <0.00%> (-0.13%)	⬇️
src/runtime/providers/ipx.ts	100.00% <100.00%> (ø)

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[pi0]

Thanks for PR. LGTM.

[btkostner]

Sorry about the force push. I accidentally merged in master branch instead of main. Should be all fixed now