Remove fetch request from heatmap (#13623)

* Remove fetch request from heatmap

Render heatmap data directly to HTML, eliminating one HTTP request on
frontpage and user profile. Also added min-height to the container so
the page content will no longer move after loading.

* rename and error display

* also log the js error

* add error handler

* remove useless inline style and hide divider on small screens

* Update routers/user/home.go

* Update routers/user/profile.go

templates/base/head.tmpl

@@ -36,8 +36,6 @@
 			SimpleMDE: {{if .RequireSimpleMDE}}true{{else}}false{{end}},
 			Tribute: {{if .RequireTribute}}true{{else}}false{{end}},
 			U2F: {{if .RequireU2F}}true{{else}}false{{end}},
-			Heatmap: {{if .EnableHeatmap}}true{{else}}false{{end}},
-			heatmapUser: {{if .HeatmapUser}}'{{.HeatmapUser}}'{{else}}null{{end}},
 			NotificationSettings: {
 				MinTimeout: {{NotificationSettings.MinTimeout}},
 				TimeoutStep:  {{NotificationSettings.TimeoutStep}},