feat(gui): use markdown to store content

[AnsonH]

Problem

Some parts of the GUI contain lots of text, such as the FAQ section in FileStructureValidation settings panel. A disadvantage of writing the content directly with JSX is that it's tedious to maintain as we need to manually add the appropriate HTML element tags.

Solution

A possible solution is that we write the content in Markdown files, then the Markdown is transformed into JSX during rendering. Here are some resources to look at:

• Markdown/MDX with Next.js
• Next.js MDX Remote Example

:+1: Advantages:

• Easier to maintain long textual content
• Easy to set up new tooltips/paragraphs with long text

:-1: Disadvantages:

• Adds complexity to the codebase in transforming Markdown to JSX
• Increased bundle size(?)

[AnsonH]

Marking this as "won't do" because it introduces too much complexity.