Fix broken documentation links

[DiegoVinasco]

• [x] Broken links can be found using this tool

• [x] This process also needs to be done within the markdown of other issues, for example #61 where several links no longer work.

• [x] Finally, a page should be created officially documenting how to move update documentation in such a way that links are less frequently broken, perhaps through a refactoring tool

[DiegoVinasco]

wiki link checking is now done through Travis CI here