[openstreetmap/openstreetmap-website] Add more files to `.dockerignore` (PR #5902)

[rkoeze]

### Description
Adds some more files to the `.dockerignore`. In general this brings up closer to the [Rails defaults](https://github.com/rails/rails/blob/1dc50194047b6a371dd78b486a247babfaa9f0e0/railties/lib/rails/generators/rails/app/templates/dockerignore.tt).

### How has this been tested?
I added `COPY .  .` to the Dockerfile and then ran `docker build -t web . && docker run --rm -it -p 3000:3000 web sh` with and without these changes to make sure that the correct files were ignored when the image was built.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5902

-- Commit Summary --

  * Add new files to .dockerignore
  * Be explicit about filepaths

-- File Changes --

    M .dockerignore (20)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5902.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5902.diff

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