update docs and examples to use shorter config secret syntax

docs/features/software-catalog/configuration.md

@@ -23,32 +23,26 @@ integrations:
   github:
     - host: github.com
       token:
-        $secret:
-          env: GITHUB_TOKEN
+        $env: GITHUB_TOKEN
     - host: ghe.example.net
       apiBaseUrl: https://ghe.example.net/api/v3
       rawBaseUrl: https://ghe.example.net/raw
       token:
-        $secret:
-          env: GHE_TOKEN
+        $env: GHE_TOKEN
   gitlab:
     - host: gitlab.com
       token:
-        $secret:
-          env: GITLAB_TOKEN
+        $env: GITLAB_TOKEN
   bitbucket:
     - host: bitbucket.org
       username:
-        $secret:
-          env: BITBUCKET_USERNAME
+        $env: BITBUCKET_USERNAME
       appPassword:
-        $secret:
-          env: BITBUCKET_APP_PASSWORD
+        $env: BITBUCKET_APP_PASSWORD
   azure:
     - host: dev.azure.com
       token:
-        $secret:
-          env: AZURE_TOKEN
+        $env: AZURE_TOKEN
 ```
 
 Each key under `integrations` is a separate configuration for each external

docs/features/software-templates/installation.md

@@ -232,15 +232,13 @@ instance:
 scaffolder:
   github:
     token:
-      $secret:
-        env: GITHUB_ACCESS_TOKEN
+      $env: GITHUB_ACCESS_TOKEN
     visibility: public # or 'internal' or 'private'
   gitlab:
     api:
       baseUrl: https://gitlab.com
       token:
-        $secret:
-          env: SCAFFOLDER_GITLAB_PRIVATE_TOKEN
+        $env: SCAFFOLDER_GITLAB_PRIVATE_TOKEN
 ```
 
 #### Azure DevOps
@@ -257,8 +255,7 @@ scaffolder:
     baseUrl: https://dev.azure.com/{your-organization}
     api:
       token:
-        $secret:
-          env: AZURE_PRIVATE_TOKEN
+        $env: AZURE_PRIVATE_TOKEN
 ```
 
 ### Running the Backend