[1pt] Create basic structure for Missions - Setup

[SaveryIV]

• Create a route and a view component. Use <NavLink /> for the page navigation links and style active class to indicate which section/page the user is currently on (underline active navigation link).
• Create a directory for all Redux state slice files.

[SaveryIV]

Link to the PR: https://github.com/SaveryIV/Space-X-Project/pull/29