Mega refactor, explanations in comments

[huijing]

Closes #357

This PR is very large (but a major reason is file moving) and comprises of:

• Consolidating and renaming all image files into the static folder
• Refactoring of all the components and their usage in the markdown files
  • Remove usage of fetch for local data files
  • Moving JSON data files out of the static folder so they are not exposed to public
• Implementing CSS modules for component-level and individual page-level styling
• Adding support for Mermaid blocks within markdown
• Fix broken styling of mobile navigation sidebar
• Remove obsolete markdown files from docs
• Fixing all instances of console errors on every page

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