This change applied a resonable color-scheme for rendered asciidoc-files
within gitea when a dark-theme is applied.
Additionally it allows for x-scrolling of big graphics within a rendered
asciidoc.
By applying this change the kubernetes cluster gets a gitea-server
setup. Note, that I use a custom-image which I have to automate in
future. The customization is necessary since I use asciidoc very often
and the default-gitea doesn't render these files, so it becomes a bit
cumbersome to read them on the web.
