feat(404-page): merge first two paragraphs together

I think that this improves the look and the flow of the page, since it's slightly more condensed and the call to action (returning to the homepage) doesn't stick out more than the wokwi description part.

Author: krisjdev

src/theme/NotFound/Content/index.js

@@ -24,8 +24,7 @@ export default function NotFoundContent({className}) {
               description="The 1st paragraph of the 404 page">
               Sorry, the page doesn't exist or has moved.
             </Translate>
-          </p>
-          <p>
+            &nbsp;
             <Translate
               id="theme.NotFound.p2"
               description="The 2nd paragraph of the 404 page"