Does anybody know where I can/should host a copy?
With torrent or IPFS, perhaps? (Given the CC BY-SA license, this would be completely legal.)
Also, GitHub's behaviour wrt to LFS is really disappointing — the epub file could have been stored normally with git (its size of ~ 3 MB is far less than the hard limit of 100 MB), in which case there would have been no issues of exceeding a data quota...
For comparison, the linked PDF is normally indexed with git, despite weighing at 7.7 MB.
Since LFS is supposed to reduce total bandwidth use for the hoster, GitHub is, in effect, punishing people for reducing GitHub's bandwidth usage...
Actually, the linked PDF is originally[0] by the same author as the EPUB version you linked. However, in the original repository[0] the PDF is managed with LFS, so it's inaccessible...
On Debian GNU/Linux, I had to install a few packages in addition to base tetex: latexmk fonts-inconsolata linuxlibertine fonts-linuxlibertine texlive-fonts-extra texlive-latex-extra
I also downloaded locally installed the two suggested fonts to /usr/local/share/fonts/truetype/
Build took a few minutes on an older box, but looks spiffy.