Spelling and dead links

[ncbarta]

Fixed spelling and deadlinks. Did not add content.

• Unclear if BS+MS link is bad or just seasonal.
• http://learningtechlab.pitt.edu/ may be broken.

I've noted various pages needing updates.

[ncbarta]

@agrattan0820 Wiki is getting some love before school starts ❤️

Would you mind merging for me? It looks like I'm not authorized.

[agrattan0820]

@NathanBarta I changed the permissions for the "pittcsc/officers" group to have Admin permissions (which you're a part of) for this repo, let me know if that allows you to merge or not

[ncbarta]

@agrattan0820 appears so, thanks!