chore: Remove outdated dev dependency

Author: twk3

.devcontainer/devcontainer.json

@@ -18,7 +18,6 @@
         "github.vscode-pull-request-github",
         "me-dutour-mathieu.vscode-github-actions",
         "redhat.vscode-yaml",
-        "rvest.vs-code-prettier-eslint",
         "yzhang.markdown-all-in-one"
       ],
       "settings": {