docs: subtree hype/docs prefix ./doc

[wfleurant]

git clone git@github.com:hyperboria/cjdns.git hypecjdns && cd hypecjdns
git remote add docs git@github.com:hyperboria/docs.git && git fetch docs
git subtree pull --squash -P doc/ docs master
git checkout -b docs-subtree

fixed any minor conflicts, then stage, commit and pushed branch to other remote

git add doc/meshlocals/existing/freifunk.md
git commit -m 'docs: subtree hype/docs prefix ./doc'
git push -u wfleurant docs-subtree

lets review b/c Lars had a better commit message than above. re: f9a5124ea0273c5a3ff448aa3157d10b44ebab2b