feat: bun related docs (@stonega)

- changed bot.ts to index.ts
- mention bun at hosting docs

site/docs/guide/getting-started.md

@@ -150,6 +150,90 @@ in your terminal before you execute `node bot.js`.
 This makes it easier to debug your bot.
 :::
 
+## Getting Started on Bun
+
+> This guide assumes that you have [Bun](https://bun.sh) installed.
+> If you don't know what these things are, check out our [Introduction](./introduction)!
+
+Create a new project and install the `grammy` package.
+Do this by opening a terminal and typing:
+
+```sh
+# Create a new directory and change into it.
+mkdir my-bot
+cd my-bot
+
+# Run bun init to scaffold a new project.
+bun init --yes
+
+# Install grammY.
+bun add grammy
+```
+
+Your folder structure should looks like this:
+
+```asciiart:no-line-numbers
+.
+├── index.ts
+├── .gitignore
+├── node_modules/
+├── package.json
+├── bun.lockb
+├── README.md
+└── tsconfig.json
+```
+
+Now, it's time to open Telegram to create a bot account, and obtain a bot token for it.
+Talk to [@BotFather](https://t.me/BotFather) to do this.
+The bot token looks like `123456:aBcDeF_gHiJkLmNoP-q`.
+It is used to authenticate your bot.
+
+Got the token? You can now code your bot in the `index.ts` file.
+You can copy the following example bot into that file, and pass your token to the `Bot` constructor:
+
+```ts [TypeScript]
+import { Bot } from "grammy";
+
+// Create an instance of the `Bot` class and pass your bot token to it.
+const bot = new Bot(""); // <-- put your bot token between the ""
+
+// You can now register listeners on your bot object `bot`.
+// grammY will call the listeners when users send messages to your bot.
+
+// Handle the /start command.
+bot.command("start", (ctx) => ctx.reply("Welcome! Up and running."));
+// Handle other messages.
+bot.on("message", (ctx) => ctx.reply("Got another message!"));
+
+// Now that you specified how to handle messages, you can start your bot.
+// This will connect to the Telegram servers and wait for messages.
+
+// Start the bot.
+bot.start();
+```
+
+You can now run the bot by executing
+
+```sh
+bun run bot.ts
+```
+
+in your terminal.
+Done! :tada:
+
+Head over to Telegram to watch your bot respond to messages!
+
+::: tip Enabling Logging
+You can enable basic logging by running
+
+```sh
+export DEBUG="grammy*"
+```
+
+in your terminal before you execute `bun run index.ts`.
+This makes it easier to debug your bot.
+:::
+
 ## Getting Started on Deno
 
 > This guide assumes that you have [Deno](https://deno.com) installed.

site/docs/guide/introduction.md

@@ -66,7 +66,7 @@ You will get to know them as you go.
 
 ## Prerequisites to Getting Started
 
-> Skip the rest of this page if you already know how to develop a Deno or a Node.js application, and [get started](./getting-started).
+> Skip the rest of this page if you already know how to develop Deno, Bun or Node.js application, and [get started](./getting-started).
 
 Here are a few interesting things about programming---things that are essential to coding, yet rarely explained because most developers think they are self-evident.
 
@@ -173,6 +173,34 @@ You can stop the bot again with `Ctrl+C`.
 Ready?
 [Get started](./getting-started#getting-started-on-deno)! :robot:
 
+### Prerequisites for Bun
+
+Bun is a new JavaScript runtime, which is another good choice to build bot, like Deno, you are going to write your bot in TypeScript.
+The exact commands for all of that will be introduced in the next section when you actually create a bot, but it is important to know that these steps are necessary.
+
+Firstly, you have to have [Bun](https://bun.sh/) installed.
+
+In summary, this is what you have to do for Bun:
+
+Create a new directory somewhere.
+It will contain your bot project.
+Open this new directory in VS Code.
+
+```sh
+mkdir ./my-bot
+cd ./my-bot
+code .
+```
+
+Then:
+
+1. Run `bun init --yes` in your terminal to initialize the project.
+2. Create a source file `bot.ts` with TypeScript code inside the project.
+3. Run `bun run bot.ts` from your terminal, or run `bun --watch run bot.ts` if you want to keep updated with file changes.
+
+Ready?
+[Get started](./getting-started#getting-started-on-bun)! :robot:
+
 ### Prerequisites for Node.js
 
 You are going to write your bot in TypeScript, but, contrary to Deno, Node.js cannot actually run TypeScript.

site/docs/hosting/firebase.md

@@ -49,7 +49,7 @@ npm install -g firebase-tools
    - TypeScript
 6. Optionally, you can select ESLint.
 7. The CLI asks you if you want to install the dependencies with npm.
-   If you use another package manager like `yarn` or `pnpm` you can decline.
+   If you use another package manager like `yarn`, `bun` or `pnpm` you can decline.
    In that case, you have to `cd` into the `functions` directory and install the dependencies manually.
 8. Open `./functions/package.json` and look for the key: `"engines": {"node": "16"}`.
    The `node` version should match your installed version of Node.js.

site/docs/hosting/vps.md

@@ -260,6 +260,10 @@ yarn global add pm2
 pnpm add -g pm2
 ```
 
+```sh [bun]
+bun add -g pm2
+```
+
 :::
 
 #### Creating an Application