Fix installation from source, which missed wombatSetup.js

[benoit74]

When installing from source code, we do not retrieve wombatSetup.js from source code (this is expected) and we have nothing in the build chain which will build it. We hence need to add it to openzim.toml so that anyone using a dependency like zimscraperlib @ git+https://github.com/openzim/python-scraperlib@main will get a working setup.

This is not expected to have side-effects because it should anyway get "overridden" with proper version in real publication to PyPi.

[benoit74]

Nota: downside is that this is still not perfect since we download wombatSetup.js from https://dev.kiwix.org/zimscraperlib/wombatSetup.js, which is the last version built from main scraperlib branch.

Anyone using a dependency like zimscraperlib @ git+https://github.com/openzim/python-scraperlib@my-branch will get every code from my-branch except wombatSetup.js which will still come from main branch code.

I think this downside is very significantly out-weighted by:

• the fact that it means we still do not need Node.JS to install zimscraperlib
• the fact that in general wombatSetup.js can be tested in isolation, merged to main and only then tested in client codebases

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.52%. Comparing base (ac1fbd9) to head (d679fb1).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #287   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          41       41           
  Lines        2516     2516           
  Branches      354      354           
=======================================
  Hits         2504     2504           
  Misses          8        8           
  Partials        4        4           

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