docs(docs): add initial Fumadocs-based documentation site

docs/content/docs/index.mdx

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+---
+title: Hello World
+description: Your favourite docs framework.
+icon: Rocket
+---
+
+Hey there! Fumadocs is a docs framework that works on Waku!
+
+## Heading
+
+Hello World!
+
+<Cards>
+  <Card title="Learn more about Waku" href="https://waku.gg" />
+  <Card title="Learn more about Fumadocs" href="https://fumadocs.dev" />
+</Cards>
+
+### CodeBlock
+
+```ts
+console.log('Hello World');
+```
+
+#### Table
+
+| Head                            | Description                         |
+| ------------------------------- | ----------------------------------- |
+| `hello`                         | Hello World                         |
+| very **important**              | Hey                                 |
+| _Surprisingly_                  | Fumadocs                            |
+| very long text that looks weird | hello world hello world hello world |

docs/content/docs/test.mdx

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+---
+title: Test
+description: This is another page
+---
+
+Hello World again!
+
+## Installation
+
+```npm
+npm i fumadocs-core fumadocs-ui
+```