Update devcontainer to include npm and publish port 3000 for working with documentation updates

.devcontainer/Dockerfile

@@ -2,14 +2,22 @@ FROM zmkfirmware/zephyr-west-action-arm
 
 ENV LC_ALL=C
 
-RUN apt-get -y update && \
+RUN apt-get -y update \
-    apt-get -y upgrade && \
+    && apt-get -y upgrade \
-    apt-get install --no-install-recommends -y \
+    && apt-get install --no-install-recommends -y \
     ssh \
     nano \
     locales \
-    gpg && \
+    ssh \
-    rm -rf /var/lib/apt/lists/*
+    gpg \
+    gpg-agent \
+    curl \
+    && curl -sL https://deb.nodesource.com/setup_14.x | bash - \
+    && apt-get -y update \
+    && apt-get install --no-install-recommends -y nodejs \
+    && node --version \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY .bashrc tmp
 RUN mv /tmp/.bashrc ~/.bashrc

.devcontainer/devcontainer.json

@@ -2,7 +2,7 @@
   "name": "ZMK Development",
   "dockerFile": "Dockerfile",
   "extensions": ["ms-vscode.cpptools"],
-  "runArgs": ["--security-opt", "label=disable"],
+  "runArgs": ["--security-opt", "label=disable", "--publish", "3000"],
   "containerEnv": {"WORKSPACE_DIR": "${containerWorkspaceFolder}"},
   "settings": { 
 		"terminal.integrated.shell.linux": "/bin/bash"