ported level docs

docs/configuring/databases/level.rst

@@ -1,15 +1,19 @@
 LevelDB
 =======
 
-Follow the instructions on the [homepage](https://github.com/designcreateplay/NodeBB/wiki) but feel free to omit the Redis installation.
+Follow the :doc:`installation instructions <../../installing/os>` for your particular OS but feel free to omit the Redis installation.
 
 After cloning NodeBB, ensure that you run:
 
+.. code::
+
     npm install levelup leveldown
 
 
 Finally, set up a directory to store your LevelDB database, for example:
 
+.. code::
+
     mkdir /var/level/
 
-Run the NodeBB install, select `level` when it prompts you for your database. If you created the folder as above, you can leave the rest of the questions as default.
+Run the NodeBB install, select ``level`` when it prompts you for your database. If you created the folder as above, you can leave the rest of the questions as default.