Check public urls

[liviopersonne]

Right now, there are 2 public urls that exist. I have removed them for now because I haven't checked them. We'll need to check that they work correctly before making them public in src/routes/index.ts:

Right now:

const NON_AUTH_PUBLIC_ROUTE_PREFIXES = [ERROR_PREFIX];

After checks:

const NON_AUTH_PUBLIC_ROUTE_PREFIXES = [ERROR_PREFIX, '/mri-mailing-list', '/posulter'];