Reorganize develop docs sidebar (#11766)

Reorganize the develop docs sidebar:

- "Development" was split up into "Enginnering Practices" and "Development Infrastructure"
- "Application" is now "Application Architecture"
- "Backend" is now "API Server" that contains a subsection "Application Domains"
- "Relay Development" is now "Ingestion"
- "SDK Development" is now "SDKs"

The rest stayed more or less the same.

An image of the reorganization can be found here:
https://private-user-images.githubusercontent.com/202325/386833719-f0271644-199d-4319-bfdf-ba1096072712.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MzE3NTgxNzEsIm5iZiI6MTczMTc1Nzg3MSwicGF0aCI6Ii8yMDIzMjUvMzg2ODMzNzE5LWYwMjcxNjQ0LTE5OWQtNDMxOS1iZmRmLWJhMTA5NjA3MjcxMi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQxMTE2JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MTExNlQxMTUxMTFaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1kMWNhNjAwOTExMDIyNWNlZTMwZmZjZjZlZmU4NDYyMmU0YjJhYmY2ZmNiMmViYmI0YWRhMjViMWU2MjAwMTFhJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.Uy-Ryfz05ZstO2COs5xH4NeUernp7IFJpR5M346c44U

---------

Co-authored-by: Liza Mock <[email protected]>

Author: antonpirker

.pre-commit-config.yaml

@@ -13,7 +13,7 @@ repos:
       - id: detect-private-key
         exclude: |
           (?x)^(
-              develop-docs/application/config.mdx|
+              develop-docs/application-architecture/config.mdx|
               develop-docs/integrations/github.mdx|
               develop-docs/self-hosted/sso.mdx
           )$