Support Cloud Docs Preview and local build

Author: pengchengrun

README.adoc

@@ -6,4 +6,56 @@ This repository only contains the source files for the published documentation.
 To view the published version, see link:https://docs.tigergraph.com/cloud[TigerGraph Cloud Documentation].
 
 == Contribution
-For instructions on how to contribute to this repository, see link:https://github.com/tigergraph/doc-site/blob/main/contribution.adoc[Contribution guidelines].
+For instructions on how to contribute to this repository, see link:https://github.com/tigergraph/doc-site/blob/main/contribution.adoc[Contribution guidelines].
+
+== Install dependencies
+To install dependencies, navigate to this repository and run:
+[,console]
+----
+npm install
+----
+
+== Build site locally
+To build the site locally, run:
+[,console]
+----
+npm run build
+----
+The build will be available in the `build/` folder in the root directory. 
+
+IMPORTANT: Though the files are all in the `/build` folder, you won't be able to access other pages through the links if the files are not served by a server.
+To preview locally, you can <<Run a local server to view the build>>. If you really don't want to use a local server, edit the `antora-playbook.yml` file in your local environment, and change the `html_extension_style` under `urls` to `default`. This allows you to open the static files and have the links work.  
+
+=== Build from your local content source repository
+To have Antora build the site from your local content source repository, change the corresponding content source in the file `antora-playbook.yml` to point to your local git repository. 
+
+See https://docs.antora.org/antora/2.3/playbook/content-source-url/#local-urls[Use local content repositories] on Antora's documentation. 
+
+== Watch Mode
+
+Watch Mode launches a local web server for preview. It will continue watching your local content source repository changes and rebuild the site.
+
+[,console]
+----
+npm run dev
+----
+
+You can access the web server at http://localhost:5000[http://localhost:5000].
+
+== Run a local server to view the build
+
+To open the build, run:
+[,console]
+----
+$ npm i -g http-server
+$ http-server build/site -c-1
+----
+Upon launching the command, the local address of the web server will be displayed in your terminal. You should see the following output in your terminal:
+
+----
+Starting up http-server, serving build/site
+Available on:
+  http://127.0.0.1:8080
+  http://192.168.1.8:8080
+Hit CTRL-C to stop the server
+----

package.json

@@ -4,7 +4,6 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
     "build": "antora generate --fetch antora-playbook.yml",
     "dev": "gulp",
     "serve": "http-server build/site -c-1"