Added Admin Dashboard Functions and Fixed Error Messages and Bugs

[ys2426]

Added Sign out confirmation message; Added New Patient forms fields error message; Fixed Previous button functionality in forms; Implemented Home & Sign out button functions in Sidebar; Removed Triangular Nav buttons with same functionalities as Next/Prev buttons for all pages"

Description

Added Several Additions and few changes to the Admin Dashboard and Pages in Admin module.

List of changes

• Added a Dialog box asking whether to sign out or stay in when sign out button is clicked (Admin Homepage or Sidebar)
• Fixed a bug where not all the mandatory fields in the new patient detail forms do not show 'field empty' warnings.
• Fixed an issue in New Patient detail forms where the "Previous" button does not function when any of the mandatory fields are empty in all the forms
• Removed a duplicate functionality - Triangular Nav buttons functioning the same as Next/Prev buttons
• Implemented functionalities for Sidebar buttons - Home and Sign out, for all pages.

Screenshots and/or Gifs