add docs to build site locally (#20342)

Signed-off-by: nitishfy <justnitish06@gmail.com>

docs/developer-guide/contributors-quickstart.md

@@ -86,6 +86,13 @@ make start-local ARGOCD_GPG_ENABLED=false
 
 ## Making Changes
 
+### Docs Changes
+
+Modifying the docs auto-reloads the changes on the [documentation website](https://argo-cd.readthedocs.io/) that can be locally built using `make serve-docs` command. 
+Once running, you can view your locally built documentation on port 8000.
+
+Read more about this [here](https://argo-cd.readthedocs.io/en/latest/developer-guide/docs-site/).
+
 ### UI Changes
 
 Modifying the User-Interface (by editing .tsx or .scss files) auto-reloads the changes on port 4000.

docs/developer-guide/docs-site.md

@@ -17,6 +17,25 @@ Before submitting a PR build the website, to verify that there are no errors bui
 make build-docs
 ```
 
+If you want to build and test the site directly on your local machine without the use of docker container, follow the below steps:
+
+1. Install the `mkdocs` using the `pip` command
+    ```bash
+    pip install mkdocs
+    ```
+2. Install the required dependencies using the below command
+   ```bash
+   pip install $(mkdocs get-deps)
+    ```
+3. Build the docs site locally from the root
+   ```bash
+   make build-docs-local
+   ``` 
+4. Start the docs site locally
+   ```bash
+   make serve-docs-local
+   ```
+
 ## Analytics
 
 !!! tip