docs: v0.21 docs freeze (#704)

docs/GettingStarted/HelmSetup.md

@@ -45,7 +45,7 @@ To install the chart with release name `devlake`,follow these steps:
     ```shell
     helm repo add devlake https://apache.github.io/incubator-devlake-helm-chart
     helm repo update
-    helm install devlake devlake/devlake --version=0.19.0-beta6 --set lake.encryptionSecret.secret=$ENCRYPTION_SECRET
+    helm install devlake devlake/devlake --version=0.20.0-beta8 --set lake.encryptionSecret.secret=$ENCRYPTION_SECRET
     ```
 
 And visit your devlake from the node port (32001 by default).
@@ -86,14 +86,14 @@ grafana by url `http://YOUR-NODE-IP:30091`
 
 ```shell
 helm repo update
-helm upgrade devlake devlake/devlake --version=0.19.0-beta6 --set lake.encryptionSecret.secret=<ENCRYPTION_SECRET>
+helm upgrade devlake devlake/devlake --version=0.20.0-beta8 --set lake.encryptionSecret.secret=<ENCRYPTION_SECRET>
 ```
 
 **If you're upgrading from DevLake v0.18.x or later versions:**
 
 ```shell
 helm repo update
-helm upgrade devlake devlake/devlake --version=0.19.0-beta6
+helm upgrade devlake devlake/devlake --version=0.20.0-beta8
 ```
 
 ### Uninstall

versioned_docs/version-v0.19/GettingStarted/HelmSetup.md

@@ -45,7 +45,7 @@ To install the chart with release name `devlake`,follow these steps:
     ```shell
     helm repo add devlake https://apache.github.io/incubator-devlake-helm-chart
     helm repo update
-    helm install devlake devlake/devlake --version=0.19.0-beta6 --set lake.encryptionSecret.secret=$ENCRYPTION_SECRET
+    helm install devlake devlake/devlake --version=0.19.0 --set lake.encryptionSecret.secret=$ENCRYPTION_SECRET
     ```
 
 And visit your devlake from the node port (32001 by default).
@@ -86,14 +86,14 @@ grafana by url `http://YOUR-NODE-IP:30091`
 
 ```shell
 helm repo update
-helm upgrade devlake devlake/devlake --version=0.19.0-beta6 --set lake.encryptionSecret.secret=<ENCRYPTION_SECRET>
+helm upgrade devlake devlake/devlake --version=0.19.0 --set lake.encryptionSecret.secret=<ENCRYPTION_SECRET>
 ```
 
 **If you're upgrading from DevLake v0.18.x or later versions:**
 
 ```shell
 helm repo update
-helm upgrade devlake devlake/devlake --version=0.19.0-beta6
+helm upgrade devlake devlake/devlake --version=0.19.0
 ```
 
 ### Uninstall

versioned_docs/version-v0.20/GettingStarted/HelmSetup.md

@@ -45,7 +45,7 @@ To install the chart with release name `devlake`,follow these steps:
     ```shell
     helm repo add devlake https://apache.github.io/incubator-devlake-helm-chart
     helm repo update
-    helm install devlake devlake/devlake --version=0.19.0-beta6 --set lake.encryptionSecret.secret=$ENCRYPTION_SECRET
+    helm install devlake devlake/devlake --version=0.20.0-beta8 --set lake.encryptionSecret.secret=$ENCRYPTION_SECRET
     ```
 
 And visit your devlake from the node port (32001 by default).
@@ -86,14 +86,14 @@ grafana by url `http://YOUR-NODE-IP:30091`
 
 ```shell
 helm repo update
-helm upgrade devlake devlake/devlake --version=0.19.0-beta6 --set lake.encryptionSecret.secret=<ENCRYPTION_SECRET>
+helm upgrade devlake devlake/devlake --version=0.20.0-beta8 --set lake.encryptionSecret.secret=<ENCRYPTION_SECRET>
 ```
 
 **If you're upgrading from DevLake v0.18.x or later versions:**
 
 ```shell
 helm repo update
-helm upgrade devlake devlake/devlake --version=0.19.0-beta6
+helm upgrade devlake devlake/devlake --version=0.20.0-beta8
 ```
 
 ### Uninstall

versioned_docs/version-v0.21/Configuration/APIKeys.md

@@ -0,0 +1,34 @@
+---
+title: "API Keys"
+sidebar_position: 31
+description: >
+  API Keys
+---
+## What is an 'API Key'
+![api-key-list](images/api-key-list.png)
+
+An API key, also known as an API token, is a string used for authentication when making requests to DevLake's open API or webhook. It serves as a form of identification to ensure authorized access.
+
+An API key contains three components:
+1. Name: This is the descriptive name assigned to the key for easy identification.
+2. Expiration: You have the option to set an expiration period for the API key, such as 7 days, 30 days, 90 days, or choose for it to never expire.
+3. Allowed Path: The API URL or endpoint that the API key is permitted to access. It defines the specific resources that the key can interact with.
+
+## How does an API key work?
+### Accessing DevLake Open APIs
+Check out the [API docs](/docs/Overview/References.md).
+
+### Utilizing API Key in [Incoming Webhooks](webhook.md)
+It is typically not necessary to manually create an API key from the 'API keys' page. Instead, you can follow these steps:
+
+1. Navigate to the 'Data Connection' page.
+2. Create a new webhook, and an API key will be automatically generated for you.
+3. You can copy the provided curl commands, which include the API key, and save them in your local environment for future use.
+4. If you happen to forget to save the API key, do not worry. You can view the webhook details and regenerate a new API key if needed. It is important to note that the API keys automatically generated for webhooks will not be displayed on the 'API keys' page.
+
+![api-key-list](images/auto-generated-api-key.png)
+
+
+## Troubleshooting
+
+If you run into any problems, please check the [Troubleshooting](/Troubleshooting/Installation.md) or [create an issue](https://github.com/apache/incubator-devlake/issues)