apply naming convention to people filenames

[solon]

• Applies a naming convention to each person's bio and profile image filename:
  • kebab-case (all lowercase with hyphens)
  • replace accented characters with non-accented versions
• By adopting this convention we can use the Jekyll page.id / person.id variable when referencing the image file, and we will avoid issues with different filesystems and Git.
  • We are still free to use special characters to correctly spell people's names in the page title and content—just not in the filename.
• Updates the people and person layouts to use the person.id / page.id variable
• Adds redirects where the person's URL changed in two cases
• Fixes #139

Note: this PR, if merged or squashed into a single commit, will cause issues for users with case-insensitive filesystems (which is the default on mac OS). For that reason, it should be merged using the Rebase and merge option which will add the individual commits from this PR to the master branch.

[rileyjshaw]

You rock. Thanks so much for pointing out the issue with case-insensitive filesystems before I messed it up, and for providing a solution. I know a lot of people have come across these error messages, and will be happy to see them gone.

One question: it looks like Diana Sánchez and Guillermo Montecinos Peña may have had their info deleted and not re-added. Am I missing something?

[solon]

One question: it looks like Diana Sánchez and Guillermo Montecinos Peña may have had their info deleted and not re-added. Am I missing something?

For some reason, there were two copies of each of their bios in the repository. This PR removes the duplicates and renames the remaining copies.

[rileyjshaw]

Oh, interesting! Alright, thanks for clearing that up.