[docs]: Revamp embedchain docs (#799)

docs/data-sources/overview.mdx

@@ -0,0 +1,24 @@
+---
+title: Overview
+---
+
+Embedchain comes with built-in support for various data sources. We handle the complexity of loading unstructured data from these data sources, allowing you to easily customize your app through a user-friendly interface.
+
+<CardGroup cols={4}>
+  <Card title="📊 csv" href="/data-sources/csv"></Card>
+  <Card title="📚🌐 docs site" href="/data-sources/docs-site"></Card>
+  <Card title="📄 docx" href="/data-sources/docx"></Card>
+  <Card title="📝 mdx" href="/data-sources/mdx"></Card>
+  <Card title="📓 notion" href="/data-sources/notion"></Card>
+  <Card title="📰 pdf" href="/data-sources/pdf-file"></Card>
+  <Card title="❓💬 q&a pair" href="/data-sources/qna"></Card>
+  <Card title="🗺️ sitemap" href="/data-sources/sitemap"></Card>
+  <Card title="📝 text" href="/data-sources/text"></Card>
+  <Card title="🌐📄 web page" href="/data-sources/web-page"></Card>
+  <Card title="🧾 xml" href="/data-sources/xml"></Card>
+  <Card title="🎥📺 youtube video" href="/data-sources/youtube-video"></Card>
+</CardGroup>
+
+<br/ >
+
+<Snippet file="missing-data-source-tip.mdx" />