Sidebar endpoint with static items list

[Dipo-Jaiye]

Description

An endpoint was added to the codebase that responds to GET requests with a json object containing the list of sidebar items offered by the Company Files Managment plugin. When the change goes live, a visit to http://companyfiles.zuri.chat/sidebar will give a JSON response of the sidebar items of the plugin to be displayed by ZC Main.
No new dependencies are required for this change.

Fixes #183

How Has This Been Tested?

With a Node version of 14+,

• npm run install-setup To install all necessary packages
• npm run dev To start the server in development mode
• Visit "http://localhost:5500/sidebar" on the browser to view the JSON response of the sidebar items. Valid JSON was displayed on the browser window with all fields necessary for the sidebar.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas (N/A)
• I have made corresponding changes to the documentation (N/A)
• My changes generate no lint warnings

[omzi]

Great!