Update appstream summary

closes #85

Author: ranfdev

data/com.ranfdev.Geopard.metainfo.xml.in.in

@@ -5,7 +5,7 @@
   <metadata_license>CC0</metadata_license>
   <project_license>GPL-3.0+</project_license>
   <name>Geopard</name>
-  <summary>A gemini browser</summary>
+  <summary>Browse gemini pages</summary>
   <description>
     <p>Geopard is a browser for the gemini protocol, that is, a lighter alternative to the web.
        Use Geopard to browse the space and reach hundreds of gemini capsules! Read stories, download files, play games...</p>