#20 Merge pull request from a-lab-nagoya/astropenguin/issue19

Update docs for the tutorial in 2024

Author: astropenguin

.devcontainer/Dockerfile

@@ -1,17 +1,25 @@
 {
     "name": "git-github-tutorial",
-    "build": {
-        "context": "..",
-        "dockerfile": "Dockerfile"
-    },
-    "extensions": [
-        "github.vscode-pull-request-github",
-        "marp-team.marp-vscode",
-        "mhutchie.git-graph",
-        "streetsidesoftware.code-spell-checker"
+    "image": "alpine/git:latest",
+    "runArgs": [
+        "--name=git-github-tutorial"
     ],
-    "settings": {
-        "files.insertFinalNewline": true,
-        "files.trimTrailingWhitespace": true
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "github.vscode-pull-request-github",
+                "marp-team.marp-vscode",
+                "mhutchie.git-graph",
+                "streetsidesoftware.code-spell-checker"
+            ],
+            "settings": {
+                "files.insertFinalNewline": true,
+                "files.trimTrailingWhitespace": true,
+                "[markdown]": {
+                    "editor.insertSpaces": true,
+                    "editor.wordWrap": "on"
+                }
+            }
+        }
     }
 }