Remove unstable bundles

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | BlogBundle / RoutingAutoBundle removed
| Tests pass?   | yes
| Fixed tickets | https://github.com/symfony-cmf/cmf-sandbox/issues/235, https://github.com/symfony-cmf/cmf-sandbox/issues/232, https://github.com/symfony-cmf/cmf-sandbox/issues/230, https://github.com/symfony-cmf/cmf-sandbox/pull/228
| License       | MIT
| Doc PR        | -