Feature/42 add user login signup

• Add login/signin page
• Show page when there is not user connected
• Add routes for the API

assigned to @theophile.huss

added 18 commits

• 76b95152...7384b2e4 - 17 commits from branch develop
• 6ff6560d - Merge branch 'develop' into 'feature/42-add-user-login-signup'

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merged