[keycloak-dev] Added server version to cached resource urls

Every time we release a new version we get a lot of people having problems with the admin console. Usually these are due to the browser caches old Angular templates. I've made a change to themes so instead of a resource being loaded from: /auth/theme/<type>/<theme name>/<resource> It's now retrieved from: /auth/resources/<server version>/<type>/<theme name>/<resource> Also, I've changed index.html for the admin console to index.ftl so that I could add the resource path (including server version, admin theme name, etc.).