v1.4.0

Added

• Add a theme toggle switch (or dark mode toggle switch or whatever). Thus, additional variables in the default stylesheet config has been added. Please take a look at the default config to
  see the added variables.
• The toggle switch is disabled by default so the params.enableThemeToggle is added to the site configuration options list.
• Add an option where the author wants to use MathJax v3 instead with params.setMathjaxToV3 site option.

Changed

• Reduce the font set for Fira Code and replaced it with a single variable font set
  in WOFF2 format.
• Update the default font stack is updated to ensure the look will be consistent since the support for variable fonts is a bit rough.
• Remove the list key requirement of projects and contact data file to being a list themselves. (I didn't know it's possible for YAML and TOML to contain an equivalent of a JSON array.)
• Make MathJax support disabled by default. With this effect, params.enableMathjax is added into the site config options.

Fixed

• Revise the static search engine index to be used.
  It uses a new separate file named index.search.json though it'll require a new
  output format to use it to avoid conflicts with the JSON feeds.