[DOC] Cleans up folder tree

README.md

@@ -6,17 +6,15 @@ To be installed into this directory structure:
 
 ```
 /opt/odoo
-       └─┬── /core       [Core Odoo project and included addons]
+      └─┬── core      [Core Odoo project and included addons]
         │
-         ├── /custom     [Modules developed in-house]
+        ├── custom    [Modules developed in-house]
         │
-         ├── /community  [Modules by OCA]
+        ├── community [Modules by OCA]
         │
-         ├── /apps       [Modules bought from third parties in the
-         │                Odoo Apps Store]
+        ├── apps      [Bought from third parties in the Odoo Apps Store]
         │
-         └── /vendor     [Modules developed by an Odoo partner
-                          under contract]
+        └── vendor    [Developed by an Odoo partner under contract]
 ```
 
 ## Repositories