docs: advise using Node 18 in deployment

packages/create-docusaurus/templates/shared/docs/intro.md

@@ -14,7 +14,7 @@ Or **try Docusaurus immediately** with **[docusaurus.new](https://docusaurus.new
 
 ### What you'll need
 
-- [Node.js](https://nodejs.org/en/download/) version 14 or above:
+- [Node.js](https://nodejs.org/en/download/) version 16.14 or above:
   - When installing Node.js, you are recommended to check all checkboxes related to dependencies.
 
 ## Generate a new site

website/docs/deployment.mdx

@@ -398,7 +398,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 18
           cache: yarn
 
       - name: Install dependencies
@@ -441,7 +441,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 18
           cache: yarn
 
       - name: Install dependencies
@@ -495,7 +495,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 18
           cache: yarn
       - name: Install dependencies
         run: yarn install --frozen-lockfile
@@ -508,7 +508,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 18
           cache: yarn
       - uses: webfactory/ssh-agent@v0.5.0
         with:
@@ -543,7 +543,7 @@ Continuous integration (CI) services are typically used to perform routine tasks
 ```yml title=".travis.yml"
 language: node_js
 node_js:
-  - '14.15.0'
+  - 18
 branches:
   only:
     - main
@@ -602,7 +602,7 @@ steps:
 
   - task: NodeTool@0
     inputs:
-      versionSpec: 14.x
+      versionSpec: '18'
     displayName: Install Node.js
 
   - script: |