Docsy update to 5b49200 and remove tmp layout override

[chalin]

• Updates Docsy
• Drops temporary file override added via Upgrade to Hugo 0.100.2 + Docsy patch #1477

Generate site-file diff:

$ npm run check-links
...
$ find public/ -name "*.html" -exec perl -pi -e 's/ aria-disabled="true" class="btn-link disabled"//g;' {} \;   
$ npm run cd:public -- git diff -bw --ignore-blank-lines -I "<html" -I "fa-(github|tasks) fa-fw" -I "aria-controls=\"td-(docs|section)-nav\"" -- . ':(exclude)*.[^h]*'
...

diff --git a/community/index.html b/community/index.html
index 5cbe4c54..665584e9 100644
--- a/community/index.html
+++ b/community/index.html
@@ -227,7 +227,7 @@ improve our workflow and …">
 </ul>
 
         
-        <p>You can find out how to contribute to these docs in our <a href="../docs/contribution-guidelines/">Contribution Guidelines</a>
+        <p>You can find out how to contribute to OpenTelemetry in our <a href="/docs/contribution-guidelines/">Contribution Guidelines</a>
     </div>
 </section>

The find-perl command strips out extra attributes that were added to breadcrumbs via google/docsy#1068.