[misc] bring back old schema of revision.txt

- store in /var/www/revision.txt
- prefix each line with the services directory

server-ce/genScript.js

@@ -12,6 +12,7 @@ switch (process.argv.pop()) {
     break
   case 'revisions':
     for (const service of services) {
+      console.log(`echo -n /var/www/sharelatex/${service.name},`)
       console.log(`git -C ${service.name} rev-parse HEAD`)
     }
     break