update Cloud Portal documentation

This is a first version of the updated cloud portal documentation to replace the old technical platform docs. I will continue to update this in subsequent MRs.

docs/cloud-portal/CP_DeveloperManual.md

 # HIFIS Cloud Portal - Developer Manual
 
-[TOC levels=2-4]: # "## Table of Contents"
-
-## Table of Contents
-- [Document History](#document-history)
-- [Scope](#scope)
-- [Development Setup](#development-setup)
-- [Conventions](#conventions)
-- [Documentation](#documentation)
-- [Development Infrastructure](#development-infrastructure)
-    - [VCS](#vcs)
-    - [CI/CD](#cicd)
-        - [CD Infrastructure](#cd-infrastructure)
-        - [Clusters and Configurations](#clusters-and-configurations)
-        - [Data import](#data-import)
-
-
 ## Document History
 
 Current Version: 1.0