Closes #1237: Enabled setting limit=0 to disable pagination in API requests; added MAX_PAGE_SIZE configuration setting

docs/api/overview.md

@@ -136,3 +136,8 @@ The response will return devices 1 through 100. The URL provided in the `next` a
     "results": [...]
 }
 ```
+
+The maximum number of objects that can be returned is limited by the [`MAX_PAGE_SIZE`](../configuration/optional-settings/#max_page_size) setting, which is 1000 by default. Setting this to `0` or `None` will remove the maximum limit. An API consumer can then pass `?limit=0` to retrieve _all_ matching objects with a single request.
+
+!!! warning
+    Disabling the page size limit introduces a potential for very resource-intensive requests, since one API request can effectively retrieve an entire table from the database.

docs/configuration/optional-settings.md

@@ -99,6 +99,14 @@ Setting this to True will display a "maintenance mode" banner at the top of ever
 
 ---
 
+## MAX_PAGE_SIZE
+
+Default: 1000
+
+An API consumer can request an arbitrary number of objects by appending the "limit" parameter to the URL (e.g. `?limit=1000`). This setting defines the maximum limit. Setting it to `0` or `None` will allow an API consumer to request all objects by specifying `?limit=0`.
+
+---
+
 ## NETBOX_USERNAME
 
 ## NETBOX_PASSWORD