Fix monospace code rendering on Android
Fix monospace code rendering on Android

The `font-family: monospace,serif;` was not working on Android 8 Chrome 69, causing code blocks to render with some variable width serif font. This change copies the --font-family-monospace variable value from the bootstrap css file in the same directory. You could alternatively use `var(--font-family-monospace)` or even remove the `font-family` declaration here and rely on the style for pre in `bootstrap.custom.min.css`.
jimporter/mkdocs,waylan/mkdocs,waylan/mkdocs,waylan/mkdocs,jimporter/mkdocs,mkdocs/mkdocs,mkdocs/mkdocs,jimporter/mkdocs,mkdocs/mkdocs