Fix README formatting and restore missing content

README.md

@@ -1,51 +1,23 @@
-# [Prism](https://prismjs.com/)
-
-[![Build Status](https://github.com/PrismJS/prism/workflows/CI/badge.svg)](https://github.com/PrismJS/prism/actions)
-[![npm](https://img.shields.io/npm/dw/prismjs.svg)](https://www.npmjs.com/package/prismjs)
-
-Prism is a lightweight, robust, and elegant syntax highlighting library. It's a spin-off project from [Dabblet](https://dabblet.com/).
-
-You can learn more on [prismjs.com](https://prismjs.com/).
-
-[Why another syntax highlighter?](https://lea.verou.me/2012/07/introducing-prism-an-awesome-new-syntax-highlighter/#more-1841)
-
-[More themes for Prism!](https://github.com/PrismJS/prism-themes)
-
 ## Contribute to Prism!
 
 ### **Important Notice**
 
 We are currently working on [Prism v2](https://github.com/PrismJS/prism/discussions/3531) and will only accept security-relevant PRs for the time being.
 
-Once work on Prism v2 is sufficiently advanced, we will accept PRs again. This will be announced on our [Discussion](https://github.com/PrismJS/prism/discussions) page and mentioned in the [roadmap discussion](https://github.com/PrismJS/prism/discussions/3531).
+Once work on Prism v2 is sufficiently advanced, we will accept regular PRs again. This will be announced on our [Discussions](https://github.com/PrismJS/prism/discussions) page.
+
+---
 
 <details>
 <summary>Prism v1 contributing notes</summary>
 
 Prism depends on community contributions to expand and cover a wider array of use cases. If you like it, consider giving back by sending a pull request. Here are a few tips:
 
 - Read the [documentation](https://prismjs.com/extending.html). Prism was designed to be extensible.
-- Do not edit `prism.js`, it’s just the version of Prism used by the Prism website and is built automatically. Limit your changes to the unminified files in the `components/` folder. `prism.js` and all minified files are generated by our build system (see below).
-- Use `npm ci` to install Prism's dependencies. Do not use `npm install` because it will cause non-deterministic builds.
-- The build system uses [gulp](https://github.com/gulpjs/gulp) to minify the files and build `prism.js`. With all of Prism's dependencies installed, you just need to run the command `npm run build`.
-- Please follow the code conventions used in the files already. For example, I use [tabs for indentation and spaces for alignment](http://lea.verou.me/2012/01/why-tabs-are-clearly-superior/). Opening braces are on the same line, closing braces on their own line regardless of construct. There is a space before the opening brace. etc etc.
-- Please try to err towards more smaller PRs rather than a few huge PRs. If a PR includes changes that I want to merge and also changes that I don't, handling it becomes difficult.
-- My time is very limited these days, so it might take a long time to review bigger PRs (small ones are usually merged very quickly), especially those modifying the Prism Core. This doesn't mean your PR is rejected.
-- If you contribute a new language definition, you will be responsible for handling bug reports about that language definition.
-- If you [add a new language definition](https://prismjs.com/extending.html#creating-a-new-language-definition) or plugin, you need to add it to `components.json` as well and rebuild Prism by running `npm run build`, so that it becomes available to the download build page. For new languages, please also add a few [tests](https://prismjs.com/test-suite.html) and an example in the `examples/` folder.
-- Go to [prism-themes](https://github.com/PrismJS/prism-themes) if you want to add a new theme.
-
-Thank you so much for contributing!!
-
-### Software requirements
-
-Prism will run on [almost any browser](https://prismjs.com/#features-full) and Node.js version but you need the following software to contribute:
-
-- Node.js >= 10.x
-- npm >= 6.x
-
-</details>
+- **Do not edit `prism.js`**. It is generated automatically for the website. Edit only the unminified files in the `components/` folder.
+- Use **`npm ci`** to install dependencies. Do not use `npm install`, as it may produce non-deterministic builds.
+- The build system uses **Gulp** to minify files and build `prism.js`. After installing dependencies, run:
 
-## Translations
+  ```sh
+  npm run build
 
-- [简体中文](https://www.awesomes.cn/repo/PrismJS/prism) (if unavailable, see [here](https://deepmind.t-salon.cc/article/113))