chore: update docs_src readme, gitignore.

Author: thePromger

.gitignore

@@ -60,3 +60,6 @@ docs_src/.vercel
 
 # generated files
 docs_src/public/rss/
+
+# env files
+*.env

docs_src/README.md

@@ -1,11 +1,22 @@
-## Docs Base
+# Docs Base
 
 This is the documentation website that will be used as a base for Robyn and Starfyre docs.
 
-## Setup
+## Environment Variables
+
+To set the enviroment variables, you have to create a .env file in docs_src folder.
+
+Here are some environment variables, you can set :
 
-1. Clone this repo
-2. Run `npm install`
-3. Run `npm run dev`
-4. Open `http://localhost:3000` in your browser
+- To provide search functionality by algolia (optional).
+  - NEXT_PUBLIC_ALGOLIA_APP_ID
+  - NEXT_PUBLIC_ALGOLIA_API_KEY
+  - NEXT_PUBLIC_ALGOLIA_INDEX_NAME
+
+## Setup
 
+1. Clone [this repo](https://github.com/sparckles/Robyn)
+2. Run `cd Robyn\docs_src`
+3. Run `npm install`
+4. Run `npm run dev`
+5. Open [`http://localhost:3000`](http://localhost:3000) in your browser