Update samples for "vela show xxx --web" (#1616)

* Update samples for "vela show xxx --web"

Also stop generating components/traits docs under
docs/en/end-user and remove the command from Makefile

Fix #1602

* fix doc build issue

* Update references/plugins/references.go

Co-authored-by: Jianbo Sun <wonderflow.sun@gmail.com>

* Enhance --web feature for "vela show"

- Find the capability in "vela-system" if notfound in the current ns
- Don't depend on local capabilities

* add ut for GetCapabilityByName in references/plugins/cluster.go

* add ut for GetNamespacedCapabilitiesFromCluster in references/plugins/cluster.go

* add ut for GenerateTerraformCapabilityProperties in references/plugins/references.go

* fix import issue

Co-authored-by: Jianbo Sun <wonderflow.sun@gmail.com>

docs/en/end-user/traits/autoscale.md

@@ -1,44 +0,0 @@
----
-title:  Autoscale
----
-
-## Description
-
-Automatically scales workloads by resource utilization metrics or cron triggers.
-
-## Specification
-
-List of all configuration options for a `Autoscale` trait.
-
-```yaml
-...
-	min: 1
-	max: 4
-	cron:
-	startAt:  "14:00"
-	duration: "2h"
-	days:     "Monday, Thursday"
-	replicas: 2
-	timezone: "America/Los_Angeles"
-	cpuPercent: 10
-```
-
-## Properties
-
-Name | Description | Type | Required | Default 
------------- | ------------- | ------------- | ------------- | ------------- 
- min | Minimal replicas of the workload | int | true |  
- max | Maximal replicas of the workload | int | true |  
- cpuPercent | Specify the value for CPU utilization, like 80, which means 80% | int | false |  
- cron | Cron type auto-scaling. Just for `appfile`, not available for Cli usage | [cron](#cron) | false |  
-
-
-### cron
-
-Name | Description | Type | Required | Default 
------------- | ------------- | ------------- | ------------- | ------------- 
- startAt | The time to start scaling, like `08:00` | string | true |  
- duration | For how long the scaling will last | string | true |  
- days | Several workdays or weekends, like "Monday, Tuesday" | string | true |  
- replicas | The target replicas to be scaled to | int | true |  
- timezone | Timezone, like "America/Los_Angeles" | string | true |  

docs/sidebars.js

@@ -37,7 +37,7 @@ module.exports = {
           'Traits': [
             'end-user/traits/ingress',
             'end-user/traits/scaler',
-            'end-user/traits/labels',
+            'end-user/traits/annotations-and-labels',
             'end-user/traits/sidecar',
             'end-user/traits/volumes',
             'end-user/traits/more',