Remove GitHub Actions for now

.gitattributes

@@ -1,4 +1,3 @@
-/.github export-ignore
 /features export-ignore
 /tests export-ignore
 

.github/main.workflow

@@ -1,10 +0,0 @@
-workflow "Main Workflow" {
-  on = "push"
-  resolves = ["PHPStan"]
-}
-
-action "PHPStan" {
-  uses = "docker://oskarstark/phpstan-ga"
-  secrets = ["GITHUB_TOKEN"]
-  args = "analyse --level=max src/"
-}