feat: running locally instructions

Author: Eric Lin

docs/getting-started/index.mdx

@@ -76,3 +76,31 @@ To avoid duplication, [Docusaurus documentation](https://docusaurus.io/docs) wil
 7. Go to the `Collaborators and teams` under `Access` on the left sidebar. Add `protocol-pliny` from the green `Add teams` button. Add any other relevant teams, such as your own as needed.
 
 8. At the moment, it is not possible to easily use branch protection on `main` when using the `semantic-release` plugin. If you disable this, then branch protection can be enabled.
+
+## Running locally
+
+You will need to have **Node.js** installed to run the live previews of the docs locally.
+
+It is highly recommended that you use a tool like [`nvm`](https://github.com/nvm-sh/nvm#installing-and-updating) to manage Node.js versions on your machine.
+
+### Installing recommended Node.js version with `nvm`
+
+1. Follow the above instructions to install `nvm` on your machine, or go [here](https://github.com/nvm-sh/nvm#installing-and-updating).
+2. Go to root folder of this project in your terminal.
+3. Run `nvm install` followed by `nvm use`. This will install the version specified by this project in the `.nvmrc` file.
+
+### Running this project
+
+1. Navigate to root folder of the project after installing Node.js
+2. Run the following in sequence, which only needs to be done once:
+
+```bash
+npm install
+npm prepare
+```
+
+3. To preview and for every time afterwards:
+
+```bash
+npm run start
+```