doc function updates and additions (#387)

doc/source/netscript/basicfunctions/rm.rst

@@ -0,0 +1,19 @@
+mv() Netscript Function
+==============================
+
+.. js:function:: rm(Filename [,hostname = current hostname])
+
+    :RAM cost: 0 GB
+
+    :param string Filename: Name of the file to be deleted.
+    :param string hostname: Hostname of the target server.
+
+    Delete a file on the given server.
+
+    .. warning!:: There is no safetychecks or recycling bins. Deleted files are lost.
+
+    Examples:
+
+    .. code-block:: javascript
+
+        ns.rm("foo.js");