Add Program Stages navbar

[jensren]

What: add the navbar for the program stages, as shown in the green box:

Why: we want to have the navbar in place so we can link the pages when we create them.

How:

• Add the navbar on the programs page
• Each link in the navbar should link to a new page, e.g. /programs/open
• The navbar links should have a chevron arrow showing which page the user is on, as shown in the Figma design
• The style does not have to match the Figma design perfectly (since the Figma is still a work in progress)
• Styles should be in a .module.css - we will be using styled components later, but we don't have that set up yet

[pratikmdhr]

I'll work on this