Create new public cloud techdocs section called "Project set management and access"

[MaxWardle]

Describe the Issue As our tech docs grow we want to make sure that the menu is still readable and intuitive to new users. Abi, Pilar and I met and had a discussion about the two new techdoc pages about user management and cost management dashboards. We decided that they warrant a new section and decided to call it "Project set management and access".

Additional Context https://developer.gov.bc.ca/docs/default/component/public-cloud-techdocs

Acceptance Criteria

• [ ] Create a new menu section called "Project set management and access"
• [ ] Add the "AWS user management" document to it
• [ ] Add the "AWS billing and cost management dashboards" document to it
• [ ] Ensure that all page titles and menu items have the same names