Remove nodejs install scripts from docs.

Author: richardpringle

website/docs/developers/frontend/index.mdx

@@ -58,22 +58,9 @@ These instructions are tested and compatible with:
 
 ### Install Node.js
 
-<Tabs groupId="operating-systems">
-<TabItem value="linux" label="Linux">
+We recommend using the latest Node.js version specified in the `.nvmrc` file at the root of the repository. You can use a Node.js version manager like `nvm` to easily switch to the correct version.
 
-<CodeBlock language="bash" title="scripts/frontend/install-nodejs-linux.sh">
-  {InstallNodejsLinux}
-</CodeBlock>
-
-</TabItem>
-<TabItem value="macos" label="macOS">
-
-<CodeBlock language="bash" title="scripts/frontend/install-nodejs-macos.sh">
-  {InstallNodejsMacos}
-</CodeBlock>
-
-</TabItem>
-</Tabs>
+For more information on how to install Node.js, please refer to the [official Node.js documentation](https://nodejs.org/en/download/package-manager/).
 
 ### Install Angular CLI
 

website/docs/developers/getting-started.mdx

@@ -81,18 +81,9 @@ This installs:
 
 **Node.js (for documentation and frontend):**
 
-<Tabs groupId="operating-systems">
-<TabItem value="linux" label="Linux (Ubuntu/Debian)">
-
-<CodeBlock language="bash">{InstallNodejsSh}</CodeBlock>
+We recommend using the latest Node.js version specified in the `.nvmrc` file at the root of the repository. You can use a Node.js version manager like `nvm` to easily switch to the correct version.
 
-</TabItem>
-<TabItem value="macos" label="macOS">
-
-<CodeBlock language="bash">{InstallNodejsMacOSSh}</CodeBlock>
-
-</TabItem>
-</Tabs>
+For more information on how to install Node.js, please refer to the [official Node.js documentation](https://nodejs.org/en/download/package-manager/).
 
 **Docker (optional, for containerized builds):**