Delete docs/system-admin-guide/system-settings/Attachments directory (#10196)

Folder exists two times in with different case, "Attachments" and "attachments".

docs/system-admin-guide/system-settings/Attachments/README.md

@@ -1,26 +0,0 @@
----
-sidebar_navigation:
-  title: Attachments settings
-  priority: 940
-title: Attachments settings
-description: Settings for max attachment size and allowed file types
-robots: index, follow
-keywords: Attachments Settings
-
----
-
-# Attachments - Max size and allowed file types
-
-1. Here you can increase or decrease **maximum attachment size** (in kB)
-
-2. The box next to **Attachment upload whitelist** is an open-entry text box in which some common file formats are pre-populated by default. The file formats in this list are specifically whitelisted or allowed to be attached to work packages. 
-   If you wish, you can add additional file formats. Use only one file format entry per line, and keep to the following cadence:  
-   
-   ​																			*****.[**file extension**]
-   
-   Example: To add mp3-files to the whitelist, your entry would be "***.mp3**".
-   
-2. Do not forget to **save** your changes.
-
-   ![attachment settings](image-20220125124252869.png)
-