[BB-3498] Implement user menu and rework page header

This PR improves the Console UI header by re-organizing menu items for better usability.

JIRA tickets: https://tasks.opencraft.com/browse/BB-3498

Discussions: None

Dependencies: None

Screenshots:

Sandbox URL: N/A

Merge deadline: None

Testing instructions:

1. Checkout this PR
2. Run Ocim - if vagrant stack, login to VirtualBox via - vagrant ssh and run make run.dev
3. Run frontend from frontend folder - npm install && npm start
4. Log in to the Ocim console.
5. On Desktop - the header should contain the Customize, My site(LMS) link, and an accounts dropdown menu with a user icon.
6. My site(LMS) shows a link icon on the right.
7. My site(LMS) shows a deployment status indicator on left.
8. On Mobile / Smaller screens - A hamburger menu icon shows and Customize, My site(LMS) link are collapsed under it.
9. Accounts dropdown should show on the right side of the Hamburger menu icon.

Author notes and concerns:

1. Deployment indicator and Custom Status pill use the same colors in their corresponding circles to show different deployment statuses.

Reviewers

• @Agrendalath