Update-helm-chart (#815)

* upgrade app in helm chart to 0.20.2

* update and correct UI env variable names in chart values.yaml

chart/stirling-pdf/Chart.yaml

@@ -1,5 +1,5 @@
 apiVersion: v2
-appVersion: 0.14.2
+appVersion: 0.20.2
 description: locally hosted web application that allows you to perform various operations on PDF files
 home: https://github.com/Stirling-Tools/Stirling-PDF
 keywords:

chart/stirling-pdf/values.yaml

@@ -16,11 +16,11 @@ commonLabels: {}
 # team_name: dev
 
 envs: []
-# - name: PP_HOME_NAME
+# - name: UI_APP_NAME
 #   value: "Stirling PDF"
-# - name: APP_HOME_DESCRIPTION
+# - name: UI_HOME_DESCRIPTION
 #   value: "Your locally hosted one-stop-shop for all your PDF needs."
-# - name: APP_NAVBAR_NAME
+# - name: UI_APP_NAVBAR_NAME
 #   value: "Stirling PDF"
 # - name: ALLOW_GOOGLE_VISIBILITY
 #   value: "true"