fix(docs): refactor and improve README

Improvements:

* Add links.
* Don't mark quick-lint-js up as code.

Style refactors:

* Word wrap at 80 columns.
* Add blank line after headings.

README.md

@@ -13,7 +13,8 @@ quick-lint-js finds many bugs, including:
 
 ## Installing
 
-There are many ways to install `quick-lint-js`, depending on how you prefer to work! Here are the environments we support:
+There are many ways to install quick-lint-js, depending on how you prefer to
+work! Here are the environments we support:
 
 - CLI (Command-Line Interface)
 - LSP (Language Server Protocol)
@@ -25,44 +26,57 @@ There are many ways to install `quick-lint-js`, depending on how you prefer to w
   - Emacs
   - Kate
 
-For detailed installation instructions, visit the [quick-lint-js installation guide](https://quick-lint-js.com/install/).
+For detailed installation instructions, visit the [quick-lint-js installation
+guide](https://quick-lint-js.com/install/).
 
 ## Examples
-Here are some common bugs that `quick-lint-js` can catch:
+
+Here are some common bugs that quick-lint-js can catch:
 
 ### Example 1: Undefined Variable
+
 ```js
 const occupation = "Engineer";
 console.log("Welcome, " + ocupation); // Typo: 'ocupation' should be 'occupation'
 ```
 Output: `use of undeclared variable: ocupation`
 
 ### Example 2: Reassigning a const variable
+
 ```js
 const name = "John";
 name = "Doe"; // Error: Cannot reassign a constant
 ```
 Output: `assignment to const variable: name`
 
 ### Example 3: Using await in a non-async function
+
 ```js
 function getData() {
   await fetch("/data");
 }
 ```
 Output: `await used in non-async function`
 
-These are just a few examples of how `quick-lint-js` can help identify common issues in your JavaScript code.
+These are just a few examples of how quick-lint-js can help identify common
+issues in your JavaScript code.
 
 ## Contributing
 
-We’re always happy to welcome new contributors! If you’d like to contribute to `quick-lint-js`, please refer to the contributing guide on our website for all the details.
+We’re always happy to welcome new contributors! If you’d like to contribute to
+quick-lint-js, please refer to the contributing guide on our website for all the
+details.
 
 Check out the [contributing guide here](https://quick-lint-js.com/contribute/).
 
 ## Contact
+
 If you have any questions or feedback, feel free to reach out:
 
 - **Bugs and feature requests**: File an issue on GitHub.
-- **IRC**: Ask questions in the quick-lint-js channel on Libera.Chat.
-- **Security bug reports** (private disclosure): Email us at [email protected]
+- **IRC**: Ask questions in the [#quick-lint-js][quick-lint-js-irc-web] channel
+  on Libera.Chat.
+- **Security bug reports** (private disclosure): Email us at
+  [[email protected]](mailto:[email protected]).
+
+[quick-lint-js-irc-web]: https://kiwiirc.com/nextclient/irc.libera.chat/#quick-lint-js