mrc-6151 get script and css from base url

[EmmaLRussell]

Deploy to epimodels with latest wodin main image is resulting in apps not rendering, because they are trying to fetch wodin.js and wodin.css from "/" rather than relative to baseUrl. This branch fixes this issue and is deployed to wodin-dev e.g. https://wodin-dev.dide.ic.ac.uk/msc-idm-2022/apps/heterogeneity-1

There's another issue, which is that a lot of the site index.html files are trying to use bootstrap.css from their site base url, which is not being found, resulting in unstyled pages e.g. https://wodin-dev.dide.ic.ac.uk/msc-idm-2022/ . I forget what we'd agreed to do there - did we say that sites ought to just use bootstrap themselves? Given that we'd like to redeploy this soon for the Royal Society app, and that we never got round to updating all the sites individually, we could just make bootstrap.css available again in the wodin container (temporarily...?) What do you think?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.77%. Comparing base (eef2b4f) to head (5380f0f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #238   +/-   ##
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  Coverage   99.77%   99.77%           
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  Files         183      183           
  Lines        4463     4463           
  Branches      990      988    -2     
=======================================
  Hits         4453     4453           
  Misses          9        9           
  Partials        1        1           

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