feat: generate shuttle index JSON

includes information about all projects:
- repo
- commit
- mux index
- mux position (X/Y)

configure.py

@@ -42,6 +42,7 @@ class Projects():
             commit_id_data = json.load(open(commit_id_file))
 
             project = Project(index, commit_id_data['repo'], project_dir, args)
+            project.commit_id = commit_id_data['commit']
 
             # projects should now be installed, so load all the data from the yaml files
             # fill projects will load from the fill project's directory