chore: Reformat the contributing guide

CONTRIBUTING.md

@@ -1,16 +1,29 @@
-# Contributing to Vodozemac
+# Contributing to vodozemac
 
 Thank you for taking the time to contribute to Matrix!
 
 This is the repository for Vodozemac, a Rust implementation of Olm and Megolm.
 
 ## Sign off
 
-We ask that everybody who contributes to this project signs off their contributions, as explained below.
-
-We follow a simple 'inbound=outbound' model for contributions: the act of submitting an 'inbound' contribution means that the contributor agrees to license their contribution under the same terms as the project's overall 'outbound' license - in our case, this is Apache Software License v2 (see [LICENSE](./LICENSE)).
-
-In order to have a concrete record that your contribution is intentional and you agree to license it under the same terms as the project's license, we've adopted the same lightweight approach used by the [Linux Kernel](https://www.kernel.org/doc/html/latest/process/submitting-patches.html), [Docker](https://github.com/docker/docker/blob/master/CONTRIBUTING.md), and many other projects: the [Developer Certificate of Origin](https://developercertificate.org/) (DCO). This is a simple declaration that you wrote the contribution or otherwise have the right to contribute it to Matrix:
+We ask that everybody who contributes to this project signs off their
+contributions, as explained below.
+
+We follow a simple 'inbound=outbound' model for contributions: the act of
+submitting an 'inbound' contribution means that the contributor agrees to
+license their contribution under the same terms as the project's overall
+'outbound' license - in our case, this is Apache Software License v2 (see
+[LICENSE](./LICENSE)).
+
+In order to have a concrete record that your contribution is intentional and you
+agree to license it under the same terms as the project's license, we've adopted
+the same lightweight approach used by the [Linux
+Kernel](https://www.kernel.org/doc/html/latest/process/submitting-patches.html),
+[Docker](https://github.com/docker/docker/blob/master/CONTRIBUTING.md), and many
+other projects: the [Developer Certificate of
+Origin](https://developercertificate.org/) (DCO). This is a simple declaration
+that you wrote the contribution or otherwise have the right to contribute it to
+Matrix:
 
 ```
 Developer Certificate of Origin
@@ -50,10 +63,13 @@ By making a contribution to this project, I certify that:
     this project or the open source license(s) involved.
 ```
 
-If you agree to this for your contribution, then all that's needed is to include the line in your commit or pull request comment:
+If you agree to this for your contribution, then all that's needed is to include
+the line in your commit or pull request comment:
 
 ```
 Signed-off-by: Your Name <[email protected]>
 ```
 
-Git allows you to add this signoff automatically when using the `-s` flag to `git commit`, which uses the name and email set in your `user.name` and `user.email` git configs.
+Git allows you to add this signoff automatically when using the `-s` flag to
+`git commit`, which uses the name and email set in your `user.name` and
+`user.email` git configs.