Document changes and release 1.3.0pureos1

debian/changelog

+librem5-user-docs (1.3.0pureos1) byzantium; urgency=medium
+
+  [ David Boddie ]
+  * Update Evergreen known issues and troubleshooting
+  * Add information about updating the submodule and tagging commits
+
+  [ Guido Günther ]
+  * Switch CI to byzantium
+  * Add gbp.conf
+  * Mark as adaptive in desktop file
+
+ -- Guido Günther <agx@sigxcpu.org>  Thu, 05 Aug 2021 20:23:48 +0200
+
 librem5-user-docs (1.3.0) amber-phone; urgency=medium
 
   * Updated information about closing applications in the shell.