Fix for broken link

The link-as-button for Join Us at https://codefordenver.org/#/about#organization sends to https://codefordenver.org/volunteer instead of https://codefordenver.org/#/volunteer. This is causing a 404 instead of displaying the volunteer page.

I tried getting the project running on my machine to test this solution, but couldn't; I believe the problem may be on line 17 of src/components/AboutOrg.tsx where it says href= instead of to= which is how all the navlink items are formatted.

Start in src/components/AboutOrg.tsx around line 17 and compare the Join Us link with the nav link items mentioned in the issue. Run the site if possible and verify that clicking Join Us reaches the volunteer page without a 404; done means the expected volunteer route renders.

Written by the indexing model from the issue text.