remove submit application template

.github/ISSUE_TEMPLATE/submit-application.md

@@ -1,15 +0,0 @@
----
-name: Submit application
-about: Add an app to this project
-title: ''
-labels: ''
-assignees: LinkLeong
-
----
-
-Tested platform
-e.g. linux/amd64,linux/arm-v7,linux-arm64
-
-
-
-Please export and upload the configuration file of this application