chore(tooling,repo): remove nix flake and add devcontainer

closes #3

.devcontainer/devcontainer.json

@@ -0,0 +1,36 @@
+{
+  "name": "myhm-commission",
+  "dockerComposeFile": "../docker-compose.dev.yml",
+  "service": "myhm-commission-dev",
+  "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+  "features": {
+    "ghcr.io/devcontainers/features/dotnet:2": {},
+    "ghcr.io/nikiforovall/devcontainer-features/dotnet-csharpier:1": {}
+  },
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  "forwardPorts": [8000],
+  // "portsAttributes": {
+  //		"8000": {
+  //			"protocol": "https"
+  //		}
+  // }
+
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-dotnettools.csharp",
+        "ms-dotnettools.vscodeintellicode-csharp",
+        "csharpier.csharpier-vscode",
+        "patcx.vscode-nuget-gallery",
+        "vasubasraj.flashpost",
+        "DavidAnson.vscode-markdownlint",
+        "aaron-bond.better-comments",
+        "donjayamanne.githistory",
+        "eamodio.gitlens"
+      ]
+    }
+  },
+  "postCreateCommand": "dotnet restore",
+  "remoteUser": "vscode"
+}