[ADF-4152] Updated folder structure of core docs (#4415)

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Manual fixes to core doc file links

* [ADF-4152] Further automatic + manual link tidying

docs/core/services/cookie.service.md

@@ -0,0 +1,46 @@
+---
+Title: Cookie service
+Added: v2.0.0
+Status: Active
+Last reviewed: 2018-11-13
+---
+
+# [Cookie service](../../../lib/core/services/cookie.service.ts "Defined in cookie.service.ts")
+
+Stores key-value data items as browser cookies.
+
+## Class members
+
+### Methods
+
+-   **clear**()<br/>
+    Placeholder for testing purposes - do not use.
+-   **getItem**(key: `string`): `string|null`<br/>
+    Retrieves a cookie by its key.
+    -   _key:_ `string`  - Key to identify the cookie
+    -   **Returns** `string|null` - The cookie data or null if it is not found
+-   **isEnabled**(): `boolean`<br/>
+    Checks if cookies are enabled.
+    -   **Returns** `boolean` - True if enabled, false otherwise
+-   **setItem**(key: `string`, data: `string`, expiration: `Date|null`, path: `string|null`)<br/>
+    Sets a cookie.
+    -   _key:_ `string`  - Key to identify the cookie
+    -   _data:_ `string`  - Data value to set for the cookie
+    -   _expiration:_ `Date|null`  - Expiration date of the data
+    -   _path:_ `string|null`  - "Pathname" to store the cookie
+
+## Details
+
+This service uses browser [cookies](https://en.wikipedia.org/wiki/HTTP_cookie)
+to store data in the form of key-value pairs. An optional `expiration` date can be
+supplied for the cookie and a `path` can be used to reduce the chances of name
+clashes with cookies from other sources.
+
+Cookies have a storage size limit that varies between browsers but is often around
+4KB. Consider using [web storage](storage.service.md) if you need to store data
+beyond this size.
+
+## See also
+
+-   [Content service](content.service.md)
+-   [Storage service](storage.service.md)