chore(docker-compose): 推奨の名前にする (#14096)

* chore(docker-compose): 推奨の名前にする

5c18e329d5/spec.md (compose-file)

* yaml to yml

* fix

* fix

.devcontainer/compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   app:
     build:

.devcontainer/devcontainer.json

@@ -1,6 +1,6 @@
 {
 	"name": "Misskey",
-	"dockerComposeFile": "docker-compose.yml",
+	"dockerComposeFile": "compose.yml",
 	"service": "app",
 	"workspaceFolder": "/workspace",
 	"features": {