Add a "light theme" button to the documentation website #106
Description
I'm using Lyra and really like it, but have a very hard time reading the HTML documentation on the web site or in the source tree because it's all in a "dark theme".
In particular, much of the sample code and other text is gray-on-black or blue-on-black, and in the default font and size, the stroke widths are very narrow. This makes it impossible for me to read that text without either zooming into the page so much I can't see all the text, or else copying and pasting into a black-on-white text editor.
For example, I was trying to figure out how to use commands and sub-commands. I'm ordinarily a very fast reader, and in a light theme, I could have found the documentation for those features in a few seconds. But the main documentation page was so hard for me to read, it took several minutes to find out them.
It would be great to have a button or something at the top of the page that changes the page style to a "light theme" to make it more legible.