The default `disabled: true` is actually only available within the module (when the config struct is used and not the user toml) but not all (the hg_branch) modules checked it there again.
Document this in all places and add the check (+ test) to the hg_branch module.
Replaces the existing nodejs module end-to-end tests with integration tests that don't require preinstalled environmental dependencies.
- Moved the tests to the same file as the module they test
- Created a render_module utility function for rendering modules within tests
- Removed Node.js installation during CI setup
- Add Shell to Context to allow for tests to not run shell-specific code
Also addresses a number of bugs:
- the percent sign not displaying correctly on some terminal emulators, including kitty
- changing the symbol in the configuration file didn't do anything
- swap being shown even if the system didn't have any
