Update dev docs to suggest using bun instead of yarn for web app

Resolves #1218

Author: debanjum

documentation/docs/contributing/development.mdx

@@ -106,13 +106,13 @@ sudo -u postgres createdb khoj --password
 
 ```shell
 cd src/interface/web/
-yarn install
-yarn export
+bun install
+bun export
 ```
 
-You can optionally use `yarn dev` to start a development server for the front-end which will be available at http://localhost:3000. This is especially useful if you're making changes to the front-end code, but not necessary for running Khoj. Note that streaming does not work on the dev server due to how it is handled with SSR in Next.js.
+You can optionally use `bun dev` to start a development server for the front-end which will be available at http://localhost:3000. This is especially useful if you're making changes to the front-end code, but not necessary for running Khoj. Note that streaming does not work on the dev server due to how it is handled with SSR in Next.js.
 
-Always run `yarn export` to test your front-end changes on http://localhost:42110 before creating a PR.
+Always run `bun export` to test your front-end changes on http://localhost:42110 before creating a PR.
 
 #### 4. Run
 1. Start Khoj