Adds Typst feature in the Dev Container configuration

Adds the feature and the Typst extension
Reference: https://github.com/michidk/devcontainers-features/tree/main/src/typst

Author: cr2007

.devcontainer/devcontainer.json

@@ -7,6 +7,7 @@
             "username": "CSK"
         },
         "ghcr.io/devcontainers/features/git-lfs:1": {},
+        "ghcr.io/michidk/devcontainers-features/typst:1": {},
         "ghcr.io/devcontainers/features/github-cli:1": {}
     },
     "customizations": {
@@ -21,7 +22,8 @@
                 "GitHub.copilot",
                 "GitHub.copilot-chat",
                 "bierner.github-markdown-preview",
-                "VisualStudioExptTeam.vscodeintellicode"
+                "VisualStudioExptTeam.vscodeintellicode",
+                "myriad-dreamin.tinymist"
             ],
 
             "settings": {