So I had to look at the applicant guidelines since there’s not a lot of guidance for mentors and this is my first time. 
My suggestion is to include items like the below, along with the timeline you propose for them.
- Community and tool acclimation
- Stakeholder input
- Front page design creation
- Front page design implementation
- Navigation bar research
- Navigation bar proposal development
- Navigation bar implementation
- (other ideas you have)
Note that the above is not meant to be prescriptive. If you don’t think you can do all of them, don’t include them. If there are other things you want to add, add them. If you want to do some of them in a different order, great!
What I’m looking for here is what you think your internship experience will look like in terms of major work phases.