Add index.html to .gitignore.
Modify quickstart page.
Write separate function for each publish target in update-gh-pages.sh.
Add latexpdf target.
update-gh-pages.sh: replace generate-index.py with shell function.
Redirect latexpdf/index.html to latexpdf/qwinff.pdf.
update-gh-pages.sh: exit when failing to copy directory.
update-gh-pages.sh: extract redirection page generating function.
Add epub target.
Initialize gh-pages branch if it doesn't exist.
Abort if git checkout master failed.
Rename update-gh-pages.sh to publish.sh.