chore(svcat): add svcat docs

Author: duanhongyi

src/installing-workflow/system-requirements.md

@@ -4,9 +4,7 @@ To run Drycc Workflow on a Kubernetes cluster, there are a few requirements to k
 
 ## Kubernetes Versions
 
-Drycc Workflow requires Kubernetes v1.3.4 or later, or Kubernetes v1.6.2 or later. Kubernetes v1.6.0
-and v1.6.1 have [a bug](https://github.com/kubernetes/kubernetes/pull/44406) that can prevent
-`git push drycc master` from completing successfully.
+Drycc Workflow requires Kubernetes v1.16.15 or later.
 
 ## Components Requirements
 
@@ -15,6 +13,10 @@ We recommend using [nginx-ingress](https://github.com/helm/charts/tree/master/st
 
 Workflow supports the use of ACME to manage automatic certificates, [cert-manager](https://github.com/helm/charts/tree/master/stable/cert-manager) is also one of the necessary components.
 
+Workflow supports stateful apps. You can create and use them through the 'drycc volumes' command. If you want to use this feature, you must have a `StorageClass` that supports `ReadWriteMany`.
+ 
+Workflow also supports the [OSB](https://github.com/openservicebrokerapi/servicebroker) API through the 'drycc resources' command. If you want to use this function, you need to install [service-catalog](https://svc-cat.io).
+
 ## Storage Requirements
 
 A variety of Drycc Workflow components rely on an object storage system to do their work, including storing application

themes/drycc/static/img/svg/steward-logo.svg

@@ -33,17 +33,17 @@ <h1><a href="/" class="logo"><img src="{{ base_url }}/static/img/svg/logo.svg" w
     <li class="small-6 medium-4 columns"><a href="https://github.com/drycc/workflow" title="Workflow">
       <img src="{{ base_url }}/static/img/svg/workflow-logo.svg" alt="Workflow">
       <h3>Workflow</h3>
-      <p>The Kubernetes-native platform (v2).</p>
+      <p>The Kubernetes platform.</p>
     </a></li>
     <li class="small-6 medium-4 columns"><a href="//helm.sh" title="Helm">
       <img src="{{ base_url }}/static/img/svg/helm-logo.svg" alt="Helm">
       <h3>Helm</h3>
-      <p>The Package manager for Kubernetes.</p>
+      <p>The Package manager.</p>
     </a></li>
-    <li class="small-6 medium-4 end columns"><a href="https://svc-cat.io" title="Steward">
-      <img src="{{ base_url }}/static/img/svg/steward-logo.svg" alt="Steward - The Kubernetes-native Service Broker">
-      <h3>Steward</h3>
-      <p>The Kubernetes-native Service Broker.</p>
+    <li class="small-6 medium-4 end columns"><a href="https://svc-cat.io" title="Service Catalog">
+      <img src="{{ base_url }}/static/img/svg/svc-cat-log.svg" alt="Service Catalog">
+      <h3>Service Catalog</h3>
+      <p>The Open Service Broker.</p>
     </a></li>
     <a class="fa fa-times right"></a>
   </div>