Refactor devcontainer and extensions configuration; remove unused extensions and obsolete architecture rules documentation

Author: Zalfsten

.devcontainer/antigravity/devcontainer.json

@@ -101,9 +101,7 @@
 				"github.copilot-chat",
 				"charliermarsh.ruff",
 				"tim-koehler.helm-intellisense",
-				"vadzimnestsiarenka.helm-template-preview-and-more",
-				"jebbs.plantuml",
-				"systemticks.c4-dsl-extension"
+				"vadzimnestsiarenka.helm-template-preview-and-more"
 			]
 		}
 	},

.devcontainer/vscode/devcontainer.json

@@ -107,9 +107,7 @@
 				"github.copilot-chat",
 				"charliermarsh.ruff",
 				"tim-koehler.helm-intellisense",
-				"vadzimnestsiarenka.helm-template-preview-and-more",
-				"jebbs.plantuml",
-				"systemticks.c4-dsl-extension"
+				"vadzimnestsiarenka.helm-template-preview-and-more"
 			]
 		}
 	},

.vscode/extensions.json

@@ -21,8 +21,6 @@
     "charliermarsh.ruff",
     "tim-koehler.helm-intellisense",
     "vadzimnestsiarenka.helm-template-preview-and-more",
-    "ms-vscode-remote.remote-containers",
-    "jebbs.plantuml",
-    "systemticks.c4-dsl-extension"
+    "ms-vscode-remote.remote-containers"
   ],
 }