[Dev] Reduce config file clutter (#290)

* Added local tooling config files to the tooling/ directory

* Moved as many docker-related files as possible

* Updated dockerfile path

* Updated the correct dockerfile instead how about

* Off day - jeez louise

* Juggled around some more dockerfiles

* more dockerfile

* More docker tests

* it's docker time

* One more shot

README.md

@@ -108,7 +108,7 @@ services:
 2. Prepare the docker image in one of the two ways below:
    - **From GHCR:** `docker pull ghcr.io/kieraneglin/pinchflat:latest`
      - NOTE: also available on Docker Hub at `keglin/pinchflat:latest`
-   - **Building locally:** `docker build . --file selfhosted.Dockerfile -t ghcr.io/kieraneglin/pinchflat:latest`
+   - **Building locally:** `docker build . --file docker/selfhosted.Dockerfile -t ghcr.io/kieraneglin/pinchflat:latest`
 3. Run the container:
 
 ```bash