CASSANDRA-16763: Updates to site-content build tools

[ossarga]

• Cassandra configuration and nodetool pages are no longer committed to git. The changes makes the run.sh -i and -n options redundant and so they have been removed.
  • README. md has been updated to reflect this change
• Changed site-content Docker file
  • Installed JDK 11 for compiling trunk and cassandra-4.0 branches
  • Made 'build' user a sudo user
• Changed the documentation generation function in the docker-entrypoint.sh
  • Always makes a copy of the repository if is supplied from the local host calling the container
  • Select the version of JDK to use based on the version of Cassandra being built

CASSANDRA-16763

[michaelsembwever]

https://cassandra.staged.apache.org/ updated using this.

[michaelsembwever]

one bug i picked up is the nav link are broken with this.

there's now lots of <a href="//_/"> … links, which break.

The deployment to staging I had to do…

for f in $(rg -l "href=\"//" content/_) ; do sed -i '' 's/href=\"\/\//href=\"\//g' $f ; done

to fix them (to make them <a href="/_/"> …).

(i also updated this comment accordingly)

otherwise looks good (and I don't mind fixing the above problem is a separate PR/commit)

[michaelsembwever]

manually merged with 60dc37b