Use [Git LFS](https://git-lfs.github.com/) to track public folder

[vanny96]

Upon cloning for the first time the lunatech-blog-engine project I noticed a very slow pull operation. Reason for that are all the static files in the /public folder.
In order to improve the version control of these files, we could use the "Large File Storage" utility provided by github to better handle these files.

[wjglerum]

Sounds like a good idea! Not sure how big that folder actually is, but when we enable that we probably also want to enable caching for the Git LFS artifacts on our GitHub Actions workflows. Otherwise we probably quickly run out of our bandwidth quota for LFS on GitHub.

See for example https://github.com/lunatech-labs/sloecentrale-tams-nextgen/blob/master/.github/workflows/maven.yml#L19