Improve accessibility scores

src/docs/components/Shell.js

@@ -97,6 +97,7 @@ const Shell = ({
           transitionEnterTimeout={300}
           transitionLeaveTimeout={300}
           component='button'
+          aria-label={isDarkMode ? 'Switch to light mode' : 'Switch to dark mode'}
           className='menu-button'
           childComponent={React.Fragment}
         >

src/docs/styles/_code.scss

@@ -58,7 +58,7 @@ code[class*="language-"]::selection, code[class*="language-"] ::selection {
   background: var(--pre-selected-color);
 }
 
-:not(pre) > code[class*="language-"] {
+:not(pre):not(a) > code[class*="language-"] {
   padding: .1em;
   border-radius: .3em;
   white-space: normal;