fix(docs): Use markdown headers to fix extra line issue

docs/docs/hardware.mdx

@@ -6,8 +6,6 @@ sidebar_label: Supported Hardware
 import HardwareList from "@site/src/components/hardware-list";
 import Metadata from "@site/src/data/hardware-metadata.json";
 
-import Heading from "@theme/Heading";
-
 import { groupedMetadata } from "@site/src/components/hardware-utils";
 
 export const toc = [
@@ -46,15 +44,11 @@ That being said, there are specific [boards](faq.md#what-is-a-board) /
 
 <HardwareList items={Metadata} />
 
-<Heading as="h2" id="other-hardware">
-  Other Hardware
-</Heading>
+## Other Hardware
 
 In addition to the basic keyboard functionality, there is also support for additional keyboard hardware such as encoders, RGB underglow, backlight and displays.
 Please see pages under the "Features" header in the sidebar for details.
 
-<Heading as="h2" id="contributing">
-  Contributing
-</Heading>
+## Contributing
 
 If you'd like to add support for a new keyboard shield, head over to the [New Keyboard Shield](development/new-shield.mdx) documentation and note the [clean room design requirements](development/clean-room.md).