Fix metainfo data

data/org.stellarium.Stellarium.appdata.xml

@@ -517,13 +517,6 @@
     <keyword xml:lang="zh-TW">宇宙</keyword>
   </keywords>
   <url type="homepage">https://www.stellarium.org/</url>
-  <url type="bugtracker">https://github.com/Stellarium/stellarium/issues</url>
-  <url type="faq">https://github.com/Stellarium/stellarium/wiki/FAQ</url>
-  <url type="help">https://www.stellarium.org</url>
-  <url type="donation">https://opencollective.com/stellarium/</url>
-  <url type="vcs-browser">https://github.com/Stellarium/stellarium</url>
-  <url type="translate">https://app.transifex.com/stellarium/stellarium/</url>
-  <url type="contribute">https://github.com/Stellarium/stellarium/blob/master/CONTRIBUTING.md</url>
   <content_rating type="oars-1.1">
     <content_attribute id="social-info">moderate</content_attribute>
   </content_rating>

data/org.stellarium.Stellarium.desktop

@@ -144,7 +144,7 @@ Exec=stellarium --startup-script=%f
 Icon=stellarium
 StartupNotify=false
 Terminal=false
-Categories=Astronomy;Education;Science;
+Categories=Education;
 Comment=Planetarium
 Comment[af]=Planetarium
 Comment[ar]=قبة سماوية

util/validate.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+echo "Check appdata.xml file:"
+appstream-util validate-relax --nonet ../data/org.stellarium.Stellarium.appdata.xml
+
+echo "\nCheck stellarium.desktop file:"
+desktop-file-validate ../data/org.stellarium.Stellarium.desktop