Ignores the eslint react errors for `react/no-is-mounted` to make CI green again. This is only a temporary solution, updating the pnpm version in our node docker images should make this obsolete.
This massively decreases the size of the font file (~ 800kb -> 20kb) and therefore its loading time. The old `.ttf` format is still being kept as a fallback, though all modern browsers support the `woff2` format.
This revision introduces a new environment variable
`IDP_LOGIN_BACKGROUND_URL` that overrides the default background image
of the IDP login page when present.
