rebase: update the rebase wrapping to works with hg 4.6
Mercurial core commit bd0086bd3af4 removed _makeextrafn hence breaking our
wrapping. Update the code to wrap rebaseruntime directly in a way that's
compatible with hg 4.1+.
mkdir -p html
cp index.html html/
cp *.css html/
cp *.js html/
cp -R img html/
cp -R graphviz-images/ html/
netlify deploy