pidgin/nest

Remove mermaid.js from footer and theme.

2020-08-20, Elliott Sales de Andrade
136c099f1388
Remove mermaid.js from footer and theme.

It is not used anywhere, and maybe should only be loaded if we actually do any mermaid diagrams.

This cuts down front page no-cache load from 1.71 MB to 914.43 kB.

Testing Done:
Loaded the front page. Also, searched for use of the mermaid shortcode, which was non-existent.

Reviewed at https://reviews.imfreedom.org/r/75/
hugo/themes/**/*
hugo/archetypes/**/*