auth: Move related templates, views and urls into application folder

cypress/e2e/add-forge-now-requests-moderation.cy.js

cypress/e2e/admin.cy.js

cypress/support/e2e.js

swh/web/admin/urls.py

swh/web/auth/templates/login.html

swh/web/auth/templates/logout.html

swh/web/auth/templates/profile.html

swh/web/auth/urls.py

swh/web/auth/views.py

swh/web/settings/common.py

swh/web/tests/auth/test_views.py

swh/web/urls.py