Add navigation bar

[mattstier]

Description

Make a navigation bar on the top of the page

Acceptance Criteria

• Include all the parts from the existing side navbar
• Merge "Join Skip" and "Membership" parts into one "Join Skip" button linking to a single page containing both
• Have "IOT Kits" redirect to an under construction page
• Rename "Posts" to "Blogs"
• Remove the existing hamburger menu, only show the hamburger menu on "mobile" devices