build: move font generation to the main repo (#2837)

* build: move font generation to the main repo

* Update fonts

* chore: remove submodules

* Update paths

* Update fonts.yml

Co-authored-by: Kevin Barabash <kevinb@khanacademy.org>

.github/workflows/ci.yml

@@ -16,7 +16,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
-        submodules: recursive
         persist-credentials: false # minimize exposure and prevent accidental pushes
 
     - name: Use Node.js 12.x
@@ -64,7 +63,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
-        submodules: recursive
         fetch-depth: 0
 
     - name: Use Node.js 12.x