Add Mediabunny Codec Registry

docs/codec-registry/vp8.md

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+<script setup>
+import { VPBadge } from 'vitepress/theme'
+</script>
+
+<VPBadge type="info" text="Video codec" />
+
+# VP8 codec registration
+
+## Description
+
+The VP8 video codec, specified in [RFC 6386](https://www.rfc-editor.org/rfc/rfc6386).
+
+## Codec ID
+
+```ts
+'vp8'
+```
+
+## `EncodedPacket` data
+
+The packet's data must be a frame as described in Section 4 and Annex A of [RFC 6386](https://www.rfc-editor.org/rfc/rfc6386).
+
+## `EncodedPacket` type
+
+If the packet's type is `'key'`, then the packet is expected to contain a frame where `key_frame` is `true`, as defined in Section 19.1 of [RFC 6386](https://www.rfc-editor.org/rfc/rfc6386).
+
+## `VideoDecoderConfig` codec string
+
+```ts
+'vp8'
+```
+
+## `VideoDecoderConfig` description
+
+`description` is not used for this codec.