Remove wiki references and update related assets

Author: dogedede

_data/donate.yml

@@ -9,7 +9,7 @@
   title: founder
   description: >-
     You can tip money to celeron55. He is the original creator of Luanti,
-    and hosts the forums and documentation sites. While he isn't involved in active
+    and hosts the forums and wikis. While he isn't involved in active
     development, he plays an advisory role and breaks ties.
   links:
     Liberapay: https://liberapay.com/celeron55/

_data/edu.yml

@@ -164,7 +164,7 @@ resources:
   tag: To host servers
   para: >-
     A dashboard to create worlds for future-oriented learning without hosting
-    servers. Comes with support (in English/French/German), documentation and
+    servers. Comes with support (in English/French/German), a wiki and
     workshops. It's currently free to use.
   url: https://www.blockalot.de/
 

_includes/pages/get-involved.html

@@ -171,8 +171,7 @@ <h3 class="is-size-3">{{ "Project Structure" | i18n }}</h3>
 			<p>
 				{{ "For more information, see the
 				<a href='https://docs.luanti.org/about/glossary/'>glossary</a> or
-				<a href='https://docs.luanti.org/for-engine-devs'>engine overview</a>
-				developer documentation pages." | i18n }}
+				<a href='https://docs.luanti.org/for-engine-devs'>engine overview</a>." | i18n }}
 			</p>
 
 			<h3 class="is-size-3">{{ "Roadmaps and Future Plans" | i18n }}</h3>