Fix regression of code links being blue (Qiskit#336)

Closes Qiskit#335.

I git bisected this to
Qiskit#292. Before, we
weren't actually fully running `theme.js` because JavaScript errors
prevented the file from fully executing. @coruscating identified that
before the regression, the HTML elements did not have the class
`.has-code`, but after they did. I suspect `theme.js` is responsible for
that (but I couldn't figure out how!)

Either way, these rules about `.has-code` are bad. We should not be
setting links to be blue.

qiskit_sphinx_theme/pytorch_base/static/css/theme.css

@@ -9859,11 +9859,6 @@ a:visited code.highlighter-rouge,
 a:hover code.highlighter-rouge {
   color: #4974D1;
 }
-a:link.has-code,
-a:visited.has-code,
-a:hover.has-code {
-  color: #4974D1;
-}
 
 p code,
 h1 code,
@@ -10597,17 +10592,6 @@ a.headerlink:hover{
   color: var(--purple) !important;
 }
 
-a:link.has-code,
-a:hover.has-code,
-a:visited.has-code {
-  color: #4974D1;
-}
-a:link.has-code span,
-a:hover.has-code span,
-a:visited.has-code span {
-  color: #4974D1;
-}
-
 article.pytorch-article ul,
 article.pytorch-article ol {
   padding-left: 1.0rem;