clarify agent kwargs types + upd s3 read doc on types

docs/app/agents/Agent.mdx

@@ -462,12 +462,13 @@ More generally, Variables and Labels can be flexibly used to control Connection
 
 And [modified in the corresponding Connections panel in the Ganymede web app after installation, for Agent versions 4.5+](AgentMonitoring#monitoring-agent-connections).
 
-
-Variables and labels can be referenced in your user-defined code by extracting the values from `kwargs` in the _execute_ function:
+Variables and labels can be referenced in your user-defined code by extracting the values from `kwargs` in the _execute_ function.
 
 ```python
+# Labels comes back as a list of strings
 labels = kwargs.get('labels', [])
-# -- OR --
+
+# All variables retrieved have a dict[str, str] type
 variables = kwargs.get('vars', {})
 
 # Example: Retrieve the `input_path` variable for use in Agent code

docs/nodes/App/S3_Read.md

@@ -63,9 +63,17 @@ Specify list of S3 keys to upload to GCS
 
 ### Returns
 
-`dict[str, str]`
-  Dictionary specifying files to upload to GCS.  The keys are the keys in S3 and the values
-  are the file names to use in Ganymede
+`dict[str, str] | NodeReturn`
+  If dict, files to upload to GCS.  The keys are the keys in S3 and the values
+  are the file names to use in Ganymede.
+
+  If NodeReturn, object containing data to store in data lake and/or file storage.
+  NodeReturn object takes 2 parameters:
+
+  - tables_to_upload: dict[str, pd.DataFrame]
+      keys are table names, values are pandas DataFrames to upload
+  - files_to_upload: dict[str, bytes]
+      keys are file names, values are file data to upload
 
 ### Examples
 

src/css/custom.css

@@ -188,6 +188,22 @@
   color: var(--ifm-color-gray-light);
 }
 
+.purple_alt_button {
+  border: 1px;
+  display: inline-block;
+  border-radius: 2px;
+  padding-left: 20px;
+  padding-right: 20px;
+  padding-top: 20px;
+  padding-bottom: 20px;
+  border-style: solid;
+  vertical-align: text-middle;
+  background-color: #736bdd;
+  stroke-width: 0.1px;
+  color: white;
+}
+
+
 .button.purple_button_dashboard {
   border: 0px;
   padding-left: 6px;