Transformed 'concat' folder structure into sub-folder structure + added bicep modules

[AlexanderSehr]

Change

Instead of structing sub-resources into a structure such as

Microsoft.Sql
├─ server [module]
└─ serverDatabases [module]

it is now instead solved like

Microsoft.Sql
├─ server [module]
└─ serverResources
     └─ databases [module]

which is in closer alignment to the ARM template reference.

Also added bicep modules for:

• SharedImageGallery
• ResourceGroup
• WVDApplication
• StorageAccount

Removed bicep module for:

• KeyVault (as it is work in progress)

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update (Wiki)

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• My corresponding pipelines / checks run clean and green without any errors or warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (readme)
• I did format my code

[segraef]

This makes more sense, Thanks.
Adjusted PR readme as well.

Microsoft.Sql
├─ server [module]
└─ serverResources
└─ databases [module]