[MVC] - Create section for static features

Proposal

Build out the static section of the super sidebar and organize the features into their respective order. In this MVC, the changes will be as least controversial as possible.

Layout	States

Features in the static section

Groups

Group overview
Members
Epics
Issues
Merge requests

Projects

Project overview
Issues
Merge requests

Admin area

Dashboard

Your work

Projects
Groups
Issues
Merge requests
To-do List
Milestones
Snippets
Activity

Profile

Profile overview
Activity
Groups
Contributed projects
Personal projects
Starred projects
Snippets
Followers
Following

Help center

Help

Explore

Projects
Groups
Topics
Snippets

User settings

Profile
Account
Billing
Applications
Chat
Access Tokens → Access tokens
Emails
Password
Notifications
SSH Keys → SSH keys
GPG Keys → GPG keys
Preferences
Active Sessions → Active sessions
Authentication log
Usage Quotas → Usage quotas

Interaction behavior

Checkout the codepen example @nickbrandt setup to demonstrate basic functionality and interactions.

There is no limit to the number of items listed in the static section. Although it is discouraged to use more than 3 total including the landing page specifically in the Admin Area, Groups, and Projects. For now, Groups will be permitted to use 5 static items and the Admin area will use even more until they have been properly organized.
When switching contexts or directly landing on a group, project, or in the admin area the default option should be to go to the landing page.

Edge cases `*`

These are features that are not commonly encountered. If there is chance that it might be a controversial change, then a thread is being added to discuss options.

Users can set a preference to choose what page they land on in groups and projects. If they change from the default, then that would change which page they land on first.
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