Closes #1656

Closes #1657

Closes #1652

This reverts commit 11ce8a53.

`Adds a config validation check for timezone, checking it against the list in moment-timezome.js`. Configs with invalid timezones will raise a configuration error.

Closes #1483 

Trying again to close #1642

docs: fix wrong url

As suggested in #1338

Fixes #1632

Now semantic-release tags without `v` prefix so updating post-push hook.

We need to parse $IMAGE_NAME because $CACHE_TAG is broken on Docker Hub post_push

Docker's build process doesn't allow you to ADD or COPY files from outside the directory tree. e.g. `ADD ../package.json .` is forbidden. The only option I can see is to move it and `hooks` back into the project root.

Adds a Dockerfile for building with Docker Hub

fix: return non-zero exit code if any errors