Docs: add descriptions for Webpack, Parcel and Vite guides (#40714)

Co-authored-by: Julien Déramond <[email protected]>

site/content/docs/5.3/getting-started/parcel.md

@@ -13,6 +13,10 @@ thumbnail: guides/[email protected]
 **Want to skip to the end?** Download the source code and working demo for this guide from the [twbs/examples repository](https://github.com/twbs/examples/tree/main/parcel). You can also [open the example in StackBlitz](https://stackblitz.com/github/twbs/examples/tree/main/parcel?file=index.html) but not run it because Parcel isn't currently supported there.
 {{< /callout >}}
 
+## What is Parcel?
+
+[Parcel](https://parceljs.org/) is a web application bundler designed to simplify the development process with a zero-configuration setup out of the box. It offers features found in more advanced bundlers while focusing on ease of use, making it ideal for developers seeking a quick start.
+
 ## Setup
 
 We're building a Parcel project with Bootstrap from scratch, so there are some prerequisites and upfront steps before we can really get started. This guide requires you to have Node.js installed and some familiarity with the terminal.

site/content/docs/5.3/getting-started/vite.md

@@ -16,6 +16,10 @@ added:
 **Want to skip to the end?** Download the source code and working demo for this guide from the [twbs/examples repository](https://github.com/twbs/examples/tree/main/vite). You can also [open the example in StackBlitz](https://stackblitz.com/github/twbs/examples/tree/main/vite?file=index.html) for live editing.
 {{< /callout >}}
 
+## What is Vite?
+
+[Vite](https://vite.dev/) is a modern frontend build tool designed for speed and simplicity. It provides an efficient and streamlined development experience, especially for modern JavaScript frameworks.
+
 ## Setup
 
 We're building a Vite project with Bootstrap from scratch, so there are some prerequisites and upfront steps before we can really get started. This guide requires you to have Node.js installed and some familiarity with the terminal.

site/content/docs/5.3/getting-started/webpack.md

@@ -13,6 +13,10 @@ thumbnail: guides/[email protected]
 **Want to skip to the end?** Download the source code and working demo for this guide from the [twbs/examples repository](https://github.com/twbs/examples/tree/main/webpack). You can also [open the example in StackBlitz](https://stackblitz.com/github/twbs/examples/tree/main/webpack?file=index.html) for live editing.
 {{< /callout >}}
 
+## What is Webpack?
+
+[Webpack](https://webpack.js.org/) is a JavaScript module bundler that processes modules and their dependencies to generate static assets. It simplifies managing complex web applications with multiple files and dependencies.
+
 ## Setup
 
 We're building a Webpack project with Bootstrap from scratch, so there are some prerequisites and upfront steps before we can really get started. This guide requires you to have Node.js installed and some familiarity with the terminal.