Refactor about.php

- Hardcode source code URL and credits in about template, remove from DB/admin interface; only contacts remains editable
- Merge apropos editables into one À propos section, remove charte, add editable source code URL

.gitignore

@@ -8,6 +8,8 @@ app/storage/test.db
 
 ### Logs ###
 error.log
+app/storage/logs/*.log
+!app/storage/logs/.gitkeep
 app/storage/maintenance.flag
 app/storage/cache/*
 !app/storage/cache/.gitkeep