Docs: Turn data modeling into semantic metadata under core concepts (#174)

## Description 📝

Transforms the `data modeling` section into `semantic metadata`
according to the
[HEP](https://docs.google.com/document/d/1NcynH-m2npqdAvjdaWlkbOl2WJy30VQgYk_UGCdMiXQ/edit?usp=sharing).

## Quick Links 🚀

[Metadata's
index](https://robdominguez-doc-2909-turn-d.promptql-docs.pages.dev/metadata/)

Author: robertjdominguez

docs/architecture.mdx

@@ -71,4 +71,4 @@ performance through the distributed execution layer.
 ## Next steps
 
 With a broad perspective of the different services powering a PromptQL application, we recommend learning more about the
-[semantic metadata layer](/data-modeling/index.mdx) next.
+[semantic metadata layer](/metadata/index.mdx) next.

docs/business-logic/dev-mode.mdx

@@ -29,7 +29,7 @@ If you're adding new functions that will need to be exposed as [commands](/refer
 your application, or modifying existing functions' arguments or return types, you'll still need to regenerate your
 metadata and create a new build of your application.
 
-Follow the steps [here](/data-modeling/iterate.mdx) for more information.
+Follow the steps [here](/metadata/guides/iterate.mdx) for more information.
 
 :::
 

docs/capabilities.mdx

@@ -40,7 +40,7 @@ means something specific in your business, or that certain metrics should always
 
 :::info Learn more
 
-You can learn more about PromptQL's semantic understanding [here](/data-modeling/index.mdx).
+You can learn more about PromptQL's semantic understanding [here](/metadata/index.mdx).
 
 :::