Add compression to dev environment to match production configuration

[SimonFrings]

This pull request improves the configuration for the dev environment by enabling HTTP compression (brotli and gzip). Our production system uses a content delivery network (CDN) which uses brotli compression by default with a possible fallback to gzip. Our current dev environment configuration doesn't allow compression, which will change through my suggestion and thus better aligns our production environment and our dev environment.

As a first step, I made sure that our production system works with the improved integration tests like this:

bash tests/integration.bash https://framework-x.org

Once the test suite confirmed my changes, I improved the dev configuration and ran the same tests against the new dev environment:

bash tests/integration.bash

This is also confirmed by our automated test suite (which uses dev environment), so I think this pull request is save to apply and will have no impact on the production system 👍

Builds on top of #40 and others.

[clue]

@SimonFrings Thanks for looking into this, changes LGTM!