chore:Update docs/Configuration.md with info about appsettings.json (#…

…1098)

Also remove iadvertently added appssetings.DevelopmentAuth.json

docs/Configuration.md

@@ -51,6 +51,9 @@ When a pull request containing configuration changes is merged with main, one of
 
 Each runtime / presentation layer adds its own configuration keys to azure app configuration through `appsettings.json` and `appsettings.[Environment].json` with a runtime tag, indicating which runtime that owns that specific configuration value. 
 
+## 2.4 Local-only configuration
+When developing, it is often useful to have configuration that is only used locally, eg. to override default `LocalDevelopment` configuration values. If a `appsettings.local.json` file is present, this file will take precedence over all other configuration files after merge. This file should **not** be checked in to the repository (it is in `.gitignore`).
+
 # 3. Autogenerated secrets
 Autogenerated secrets are secrets that is generated and used by the IaC when creating resources in Azure. When a resource which require a password is generated, the IaC bootstrap script will create a new key value pair with the name of the password as its key, and the actual password as its value. The IaC then checks if the environments key vault has a secret with the same name. If it does, the autogenerated password will be discarded and the "cached" password will be used. If not, it will add/"cache" the autogenerated password to the key vault and use it when creating the resource. 
 
@@ -107,4 +110,4 @@ There are two conventions, one that targets a specific environment, and one "any
 | iDoNotFollowTheConvention     |                     | false        | Is ignored as it does not follow any convention.        |
 
 ## 4.2. How to
-Instruct your friendly secrets manager to modify the desired key value pair in the source key vault before merging your pull request to the main branch. 
+Instruct your friendly secrets manager to modify the desired key value pair in the source key vault before merging your pull request to the main branch.