docs: add directions to run docs and benchmarks

CONTRIBUTING.md

@@ -1,19 +1,25 @@
 # Contributing to Undici
 
-* [Guides](#guides)
-  * [Update `llhttp`](#update-llhttp)
-  * [Lint](#lint)
-  * [Test](#test)
-  * [Coverage](#coverage)
-  * [Update `WPTs`](#update-wpts)
-  * [Building for externally shared node builtins](#external-builds)
-* [Developer's Certificate of Origin 1.1](#developers-certificate-of-origin)
-  * [Moderation Policy](#moderation-policy)
+- [Guides](#guides)
+  - [Update `llhttp`](#update-llhttp)
+  - [Lint](#lint)
+  - [Test](#test)
+  - [Coverage](#coverage)
+  - [Update `WPTs`](#update-wpts)
+  - [Building for externally shared node builtins](#external-builds)
+  - [Benchmarks](#benchmarks)
+  - [Documentation](#documentation)
+- [Developer's Certificate of Origin 1.1](#developers-certificate-of-origin)
+  - [Moderation Policy](#moderation-policy)
 
 <a id="guides"></a>
+
 ## Guides
 
+This is a collection of guides on how to run and update `undici`, and how to run different parts of the project.
+
 <a id="update-llhttp"></a>
+
 ### Update `llhttp`
 
 The HTTP parser used by `undici` is a WebAssembly build of [`llhttp`](https://github.com/nodejs/llhttp).
@@ -35,6 +41,7 @@ git clone git@github.com:nodejs/llhttp.git
 
 cd llhttp
 ```
+
 #### Checkout a `llhttp` release
 
 ```bash
@@ -84,6 +91,7 @@ npm run build:wasm
 Create a commit which includes all of the updated files in lib/llhttp.
 
 <a id="update-wpts"></a>
+
 ### Update `WPTs`
 
 `undici` runs a subset of the [`web-platform-tests`](https://github.com/web-platform-tests/wpt).
@@ -108,6 +116,7 @@ git sparse-checkout add /mimesniff
 git sparse-checkout add /storage
 git sparse-checkout add /service-workers
 ```
+
 </details>
 
 #### Sparse-clone the [wpt](https://github.com/web-platform-tests/wpt) repo
@@ -153,20 +162,25 @@ npm run lint
 ```
 
 <a id="test"></a>
+
 ### Test
 
 ```bash
 npm run test
 ```
 
 <a id="coverage"></a>
+
 ### Coverage
 
 ```bash
 npm run coverage
 ```
 
+<a id="benchmarks"></a>
+
 <a id="external-builds"></a>
+
 ### Building for externally shared node builtins
 
 If you are packaging `undici` for a distro, this might help if you would like to use
@@ -176,36 +190,55 @@ To enable this, pass `EXTERNAL_PATH=/path/to/global/node_modules/undici` to `bui
 You shall also pass this path to `--shared-builtin-undici/undici-path` in Node.js's `configure.py`.
 
 <a id="developers-certificate-of-origin"></a>
+
+### Benchmarks
+
+```bash
+cd benchmarks && npm i && npm run bench
+```
+
+The benchmarks will be available at `http://localhost:3042`.
+
+<a id="documentation"></a>
+
+### Documentation
+
+```bash
+cd docs && npm i && npm run serve
+```
+
+The documentation will be available at `http://localhost:3000`.
+
 ## Developer's Certificate of Origin 1.1
 
 By making a contribution to this project, I certify that:
 
-* (a) The contribution was created in whole or in part by me and I
+- (a) The contribution was created in whole or in part by me and I
   have the right to submit it under the open source license
   indicated in the file; or
 
-* (b) The contribution is based upon previous work that, to the best
+- (b) The contribution is based upon previous work that, to the best
   of my knowledge, is covered under an appropriate open source
   license and I have the right under that license to submit that
   work with modifications, whether created in whole or in part
   by me, under the same open source license (unless I am
   permitted to submit under a different license), as indicated
   in the file; or
 
-* (c) The contribution was provided directly to me by some other
+- (c) The contribution was provided directly to me by some other
   person who certified (a), (b) or (c) and I have not modified
   it.
 
-* (d) I understand and agree that this project and the contribution
+- (d) I understand and agree that this project and the contribution
   are public and that a record of the contribution (including all
   personal information I submit with it, including my sign-off) is
   maintained indefinitely and may be redistributed consistent with
   this project or the open source license(s) involved.
 
 <a id="moderation-policy"></a>
+
 ### Moderation Policy
 
 The [Node.js Moderation Policy] applies to this project.
 
-[Node.js Moderation Policy]:
-https://github.com/nodejs/admin/blob/main/Moderation-Policy.md
+[Node.js Moderation Policy]: https://github.com/nodejs/admin/blob/main/Moderation-Policy.md