Give React SPA frontend specific things a home

[hmpf]

Closes #900

App settings come in two varieties:

1. App specific settings, often with a prefix
2. Standard django settings that the app assumes is set in a certain way

Much have been written about the best way to tackle 1. Not much about 2.

Furthermore standard django settings are of two types: Overridable (like DEBUG) and should be mutated in place (MIDDLEWARE, TEMPLATES..) The trend is towards more complex settings like the latter.

Finally, there's what to do about the root urls.py.

[elfjes]

Nice, I like where this is going :), Do you want to make spa an app?

[hmpf]

Nice, I like where this is going :), Do you want to make spa an app?

It doesn't need to be. It has no models, templates, static files, template tags or other things that is autodiscovered.

The goal is to delete the directory and anything mentioning "spa" one happy day.

[hmpf]

test_CI.py had DOS line ends which really sucks when "git add -p" with new code that has unix line ends. The commit "Strip \r from lineends" needs to go in .git_blame_ignore_revs when everything is ready.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[hmpf]

Replaced by #907