hugo config: make title field editable in the CMS

[tanyabouman]

- Summary

• change site title to Kaldi instead of Homepage
• put hugo config and footer together in a Site Settings category

- Test plan

deploy

- Description for the changelog

make title field editable in CMS

- A picture of a cute animal (not mandatory but encouraged)

[tanyabouman]

I would disable previews for site settings, what do you think?

Good idea!