Move fonts.less from Khan/KaTeX

[kevinbarabash]

Summary:
This will allow us to remove the symlink from Khan/KaTeX to
this repo's font folder without changing any of the paths in
fonts.less.

Test Plan:

• npm run prepublishOnly (in Khan/KaTeX)
• see that it puts the fonts in the correct folders in build

[ylemkimon]

I think original Git history should be preserved. Also, this repo seems to be missing a LICENSE.

[kevinbarabash]

@ylemkimon I'm not sure how to migrate the git history. Do you know how? I will definitely add a LICENSE file.

[ylemkimon]

I think we can rewrite git history only for fonts.less and merge it like:

git clone https://github.com/Khan/KaTeX.git
cd KaTeX
git remote rm origin # to prevent from accidental push
git filter-branch --prune-empty --subdirectory-filter static -- --all
git filter-branch -f --prune-empty --index-filter "git rm --cached --ignore-unmatch $(git ls-files | grep -v 'fonts.less')" # single/double quote handling may differ
cd ..
git clone https://github.com/KaTeX/katex-fonts.git
cd katex-fonts
git checkout -b <branch name>
git remote add KaTeX ../KaTeX
git fetch KaTeX
git branch KaTeX remotes/KaTeX/master
git merge --allow-unrelated-histories KaTeX
git remote rm KaTeX

[kevinbarabash]

@ylemkimon thanks for the gitfu. It worked like a charm except for the --index-filter command. I had to change it to:

git filter-branch -f --prune-empty --index-filter 'git rm --cached --ignore-unmatch $(git ls-files | grep -v fonts.less)'