Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a bug report
 title: ''
-labels: bug
+labels: bug, question / discussion
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/installation-issue.md

@@ -1,10 +0,0 @@
----
-name: Installation Issue
-about: Do you need help to install Miniflux?
-title: ''
-labels: installation issue
-assignees: ''
-
----
-
-

.github/ISSUE_TEMPLATE/question---discussion.md

@@ -1,10 +0,0 @@
----
-name: Question / Discussion
-about: Open discussions
-title: ''
-labels: question / discussion
-assignees: ''
-
----
-
-