[doc,hugo] Make blockquote do something

Without this patch, a block quote is rendered exactly the same as any
other paragraph. Add a couple of em's of padding to the left to indent
it.

Don't put e.g. a vertical bar on the left: for the technical
documentation we're writing, a blockquote is much more useful as a
"here's a side note" than as an actual quote.

Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
diff --git a/site/docs/assets/scss/_markdown.scss b/site/docs/assets/scss/_markdown.scss
index 201e966..30d85b3 100644
--- a/site/docs/assets/scss/_markdown.scss
+++ b/site/docs/assets/scss/_markdown.scss
@@ -49,6 +49,10 @@
     font-size: inherit;
   }
 
+  blockquote {
+    padding-left: 2em;
+  }
+
   a {
     color: $dark-purple;
     color: var(--text-color);