document gh-pages deploy

Author: michielbdejong

Documentation/developers/publish_README.md

@@ -0,0 +1,12 @@
+To publish the icons, examples, etc to https://solid.github.io/solid-ui/ do the following:
+```sh
+git fetch origin
+git checkout gh-pages
+git pull
+git merge origin/master
+npm run build
+git commit -am"npm run build"
+git push
+```
+
+FIXME: We should make Travis do this automatically.