do not always download bootstrap, delete old bootstrap

[Grotax]

Currently bootstrap is always downloaded regardless of the current installed version.

The current code downloads bootstrap and stores it as bootstrap-$version-dist in /var/www/gw-status

Meaning if the same version exists it's overwritten by ansible.

If there is an older version, it's not deleted.

brunsbach ➜  gw-status ls
bootstrap-5.3.1-dist  bootstrap-5.3.2-dist  bootstrap-5.3.3-dist  cover.css  index.html

Option 1: instead of having versioned dir move content to simple bootstrap-dist dir
-> download still happening

Option 2: check version, only download if the current version is older, there might be multiple dirs if cleanup was not done; do cleanup after install