add a lib for rendering text in sdl2 and rules to make in makefile

SDL2_ttf/external/harfbuzz/.ci/deploy-docs.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -x
+set -o errexit -o nounset
+
+DOCSDIR=build-docs
+REVISION=$(git rev-parse --short HEAD)
+
+rm -rf $DOCSDIR || exit
+mkdir $DOCSDIR
+cd $DOCSDIR
+
+cp ../build/docs/html/* .
+#cp ../build/docs/CNAME .
+
+git init
+git branch -m main
+git config user.name "CI"
+git config user.email "harfbuzz-admin@googlegroups.com"
+set +x
+echo "git remote add upstream \"https://\$GH_TOKEN@github.com/harfbuzz/harfbuzz.github.io.git\""
+git remote add upstream "https://$GH_TOKEN@github.com/harfbuzz/harfbuzz.github.io.git"
+set -x
+git fetch upstream
+git reset upstream/main
+
+touch .
+git add -A .
+
+if [[ $(git status -s) ]]; then
+  git commit -m "Rebuild docs for https://github.com/harfbuzz/harfbuzz/commit/$REVISION"
+  git push -q upstream HEAD:main
+fi