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Fixes #107

Fixes #89

refs #107

and also display a marker with a color depending on the issue status

Fixes #99

fix #96

The manifest has been renamed in https://github.com/angular/angular-cli/commit/2326850374cd393a825e339beb5846afcff87f8a
and should have been migrated automatically but that was not the case.
This commit updates it (I added `@angular/pwa` to a brand new v12 project and made the same changes here).

Fixes #73

- adds axe-core and cypress-axe to check the a11y in e2e tests (and fixes the css theme to improve contrast)
- adds eslint rules for a11y and fixes related issues
- imrpoves the theme by using a primary color (so we have the buttons of the same blue as the navbar)

Fixes #66
Fixes #80