Remove Thanks Page from Sidebar

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #473)

Author: sapkkaj

community/dirdata.yaml

@@ -15,5 +15,4 @@ sidebar: |
   -   [Wiki](https://wiki.openssl.org)
   -   [Blog](/blog)
   -   [Binaries and Engines](binaries.html)
-  -   [Thanks!](thanks.html)
 ---