[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/components/error-content.component.md

@@ -0,0 +1,54 @@
+---
+Title: Error Content Component
+Added: v2.4.0
+Status: Active
+Last reviewed: 2018-09-13
+---
+
+# [Error Content Component](../../../lib/core/templates/error-content/error-content.component.ts "Defined in error-content.component.ts")
+
+Displays info about a specific error.
+
+## Basic Usage
+
+Once you have caught the error in your server you will need to redirect to `/error/errorCode` to display information about that error. 
+
+```ts
+this.router.navigate(['/error', errorCode]);
+```
+
+## Class members
+
+### Properties
+
+| Name | Type | Default value | Description |
+| ---- | ---- | ------------- | ----------- |
+| errorCode | `string` | "UNKNOWN" | Error code associated with this error. |
+| returnButtonUrl | `string` | "/" | Target URL for the return button. |
+| secondaryButtonUrl | `string` | "report-issue" | Target URL for the secondary button. |
+
+## Details
+
+Note that you need to provide values for the variables used in the view template.
+
+You can customize your error messages by adding them to the translate files inside
+`lib/core/i18n`:
+
+```json
+"ERROR_CONTENT": {
+    "404": {
+      "TITLE": "An error occurred.",
+      "DESCRIPTION": "We couldn’t find the page you were looking for.",
+      "SECONDARY_BUTTON": {
+        "TEXT": ""
+      },
+      "RETURN_BUTTON": { 
+        "TEXT": "Back to home"
+      }
+    }
+  }
+```
+
+## See also
+
+-   [Empty Content component](empty-content.component.md)