[GODT-961] Update release notes link

* on release notes, check updates if link missing
* on update set release note link
* update version and links with every check
* clean old release notes
* change paths to IEapp notes

internal/frontend/qt/frontend_nogui.go

@@ -48,6 +48,9 @@ func (s *FrontendHeadless) NotifyManualUpdate(update updater.VersionInfo, canIns
 	// NOTE: Save the update somewhere so that it can be installed when user chooses "install now".
 }
 
+func (s *FrontendHeadless) SetVersion(update updater.VersionInfo) {
+}
+
 func (s *FrontendHeadless) NotifySilentUpdateInstalled() {
 }