🐛 rewrite '/'s in urls for Parsoid articles, not just MCS

[ISNIT0]

#726

[kelson42]

• No automated testing to avoid that for the nth time we have url rewriting problems
• The way to rewrite URLs is really dirty, slow and highly probably buggy
  -> I don't want to release a new version of mwoffliner without part tested and written properly

[ISNIT0]

• No automated testing to avoid that for the nth time we have url rewriting problems

You're right, this is something that should be tested with zimcheck, I'll add a customMainPage test.

• The way to rewrite URLs is really dirty, slow and highly probably buggy
  -> I don't want to release a new version of mwoffliner without part tested and written properly

Although I agree that it'd be nice to replace the existing code with the native function, there is no evidence that the current logic is buggy, the recent re-open of #726 is nothing to do with the url handling logic, it's that the logic wasn't even applied to the HTML.
I don't want to make unnecessary changes in an already delayed release.

[codecov]

Codecov Report

Merging #954 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #954   +/-   ##
=======================================
  Coverage   62.47%   62.47%           
=======================================
  Files          20       20           
  Lines        1671     1671           
  Branches      339      339           
=======================================
  Hits         1044     1044           
  Misses        457      457           
  Partials      170      170

Impacted Files	Coverage Δ
src/util/rewriteUrls.ts	67.24% <100%> (ø)	⬆️

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