fix: remove strikethrough from literal strings (pypi#12530)

When Pygments renders HTML, t uses the `<s>` tag for string literals,
which most browsers will interpret as a Strikethrough, which is
confusing.

Introduced during a fix for pypa/readme_renderer#262 and surfaced in
project pages since.

Fixes: pypi#12484

Signed-off-by: Mike Fiedler <miketheman@gmail.com>

Signed-off-by: Mike Fiedler <miketheman@gmail.com>
Co-authored-by: Dustin Ingram <di@users.noreply.github.com>

warehouse/static/sass/blocks/_project-description.scss

@@ -258,6 +258,11 @@
     margin-right: auto;
   }
 
+  s { /* pygments Literal.String */
+    /* Override browser default behavior */
+    text-decoration: none;
+  }
+
 }