Cache js, css and woff files for a week (#26591)

increases the cache duration for css and js files from 2 hours to half a year. Should they change the versionhash changes as well and a new file is fetched. Half a year should be long enough for oc updates.

Also allows caching woff files for 7 days. Currently, there is no versionhash available, but pressing F5 will also refresh the woff files.