Improve the chart type of Visualize in sqllab (#3241)

* Improve the chart type of Visualize in sqllab & Add some css & Fix the link address in the navbar

* add vizTypes filter

superset/assets/javascripts/explore/stores/visTypes.js

@@ -78,6 +78,7 @@ export const sections = {
 export const visTypes = {
   dist_bar: {
     label: 'Distribution - Bar Chart',
+    showOnExplore: true,
     controlPanelSections: [
       {
         label: 'Chart Options',
@@ -108,6 +109,7 @@ export const visTypes = {
 
   pie: {
     label: 'Pie Chart',
+    showOnExplore: true,
     controlPanelSections: [
       {
         label: null,
@@ -124,6 +126,7 @@ export const visTypes = {
 
   line: {
     label: 'Time Series - Line Chart',
+    showOnExplore: true,
     requiresTime: true,
     controlPanelSections: [
       sections.NVD3TimeSeries[0],
@@ -194,6 +197,7 @@ export const visTypes = {
 
   bar: {
     label: 'Time Series - Bar Chart',
+    showOnExplore: true,
     requiresTime: true,
     controlPanelSections: [
       sections.NVD3TimeSeries[0],