docs(www): update contrubuting.md and next.mdx (#1343)

* docs: Update CONTRIBUTING.md

added commit convention section to the contribution docs.

* docs: Update next.mdx for dark mode

---------

Co-authored-by: shadcn <m@shadcn.com>

CONTRIBUTING.md

@@ -107,6 +107,40 @@ When adding or modifying components, please ensure that:
 2. You update the documentation.
 3. You run `pnpm build:registry` to update the registry.
 
+## Commit Convention
+
+Before you create a Pull Request, please check whether your commits comply with
+the commit conventions used in this repository.
+
+When you create a commit we kindly ask you to follow the convention
+`category(scope or module): message` in your commit message while using one of
+the following categories:
+
+- `feat / feature`: all changes that introduce completely new code or new
+  features
+- `fix`: changes that fix a bug (ideally you will additionally reference an
+  issue if present)
+- `refactor`: any code related change that is not a fix nor a feature
+- `docs`: changing existing or creating new documentation (i.e. README, docs for
+  usage of a lib or cli usage)
+- `build`: all changes regarding the build of the software, changes to
+  dependencies or the addition of new dependencies
+- `test`: all changes regarding tests (adding new tests or changing existing
+  ones)
+- `ci`: all changes regarding the configuration of continuous integration (i.e.
+  github actions, ci system)
+- `chore`: all changes to the repository that do not fit into any of the above
+  categories
+
+  e.g. `feat(components): add new prop to the avatar component`
+
+
+If you are interested in the detailed specification you can visit
+https://www.conventionalcommits.org/ or check out the
+[Angular Commit Message Guidelines](https://github.com/angular/angular/blob/22b96b9/CONTRIBUTING.md#-commit-message-guidelines).
+
+
+
 ## Requests for new components
 
 If you have a request for a new component, please open a discussion on GitHub. We'll be happy to help you out.

apps/www/content/docs/dark-mode/next.mdx

@@ -7,6 +7,14 @@ description: Adding dark mode to your next app.
 
 <Steps>
 
+### Install next-themes
+
+Start by installing `next-themes`:
+
+```bash
+npm install next-themes
+```
+
 ### Create a theme provider
 
 ```tsx title="components/theme-provider.tsx"