Added a scroll to bottom button, made the automatic scroll stop when the user scrolls up (#401)

* Added go to bottom, Smooth scroll in markdown body

* scroll margin prameter added to config

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Co-authored-by: DEVOP <DEVOP@EXAMPLE.COM>

src/config/index.mjs

@@ -104,6 +104,7 @@ export const defaultConfig = {
   clickIconAction: 'popup',
   insertAtTop: isMobile(),
   lockWhenAnswer: false,
+  answerScrollMargin: 200,
   autoRegenAfterSwitchModel: false,
   selectionToolsNextToInputBox: false,
   alwaysPinWindow: false,