Docs: Update references in `contribute/` dir (#69564)

Docs: Update references in `contribute` dir

contribute/architecture/README.md

@@ -2,11 +2,7 @@
 
 Are you looking to take on contributions with bigger impact? These guides help you get a better understanding of the structure and design of the Grafana codebase.
 
-Learn more about the backend architecture:
+Learn more about the backend architecture in [contribute/backend](/contribute/backend/README.md).
-
-- Part 1: [Services](../backend/services.md)
-- Part 2: [Communication](../backend/communication.md)
-- Part 3: [Database](../backend/database.md)
 
 Learn more about the frontend architecture:
 

contribute/backend/README.md

@@ -21,4 +21,7 @@ of familiarizing themselves with the content of
 
 ## Dependency management
 
-Refer to [UPGRADING_DEPENDENCIES.md](https://github.com/grafana/grafana/blob/main/UPGRADING_DEPENDENCIES.md).
+Refer to:
+
+- [UPGRADING_DEPENDENCIES.md](https://github.com/grafana/grafana/blob/main/UPGRADING_DEPENDENCIES.md)
+- [Upgrading dependencies](/contribute/backend/upgrading-dependencies.md)

contribute/backend/errors.md

@@ -1,6 +1,6 @@
 # Errors
 
-Grafana introduced its own error type `github.com/grafana/grafana/pkg/util/errutil.Error`
+Grafana introduced its own error type [github.com/grafana/grafana/pkg/util/errutil.Error](../../pkg/util/errutil/errors.go)
 in June 2022. It's built on top of the Go `error` interface extended to
 contain all the information necessary by Grafana to handle errors in an
 informative and safe way.

contribute/backend/instrumentation.md

@@ -8,7 +8,7 @@ Logs are files that record events, warnings and errors as they occur within a so
 
 ### Usage
 
-Use the _pkg/infra/log_ package to create a named structured logger. Example:
+Use the [pkg/infra/log](/pkg/infra/log/) package to create a named structured logger. Example:
 
 ```go
 import (

contribute/developer-guide.md

@@ -290,3 +290,4 @@ If that happens to you, chances are you've already set a lower limit and your sh
 - Read our [style guides](/contribute/style-guides).
 - Learn how to [Create a pull request](/contribute/create-pull-request.md).
 - Read about the [architecture](architecture).
+- Read through the [backend documentation](/contribute/backend/README.md).