Remove kaniko plugin and refs (#5371)

Co-authored-by: Anbraten <6918444+anbraten@users.noreply.github.com>

docs/docs/20-usage/20-workflow-syntax.md

@@ -103,9 +103,8 @@ When using the `local` backend, the `image` entry is used to specify the shell,
        - go build
        - go test
 
-   - name: publish
-+    image: woodpeckerci/plugin-kaniko
-     repo: foo/bar
+   - name: prettier
++    image: woodpeckerci/plugin-prettier
 
  services:
    - name: database
@@ -473,9 +472,11 @@ Normally steps of a workflow are executed serially in the order in which they ar
        - go build
 
    - name: deploy
-     image: woodpeckerci/plugin-kaniko
+     image: woodpeckerci/plugin-s3
      settings:
-       repo: foo/bar
+       bucket: my-bucket-name
+       source: some-file-name
+       target: /target/some-file
 +    depends_on: [build, test] # deploy will be executed after build and test finished
 
    - name: test # test will be executed immediately as no dependencies are set

docs/docs/20-usage/50-environment.md

@@ -170,20 +170,20 @@ Example commit substitution:
 
 ```diff
  steps:
-   - name: docker
-     image: woodpeckerci/plugin-kaniko
+   - name: s3
+     image: woodpeckerci/plugin-s3
      settings:
-+      tags: ${CI_COMMIT_SHA}
++      target: /target/${CI_COMMIT_SHA}
 ```
 
 Example tag substitution:
 
 ```diff
  steps:
-   - name: docker
-     image: woodpeckerci/plugin-kaniko
+   - name: s3
+     image: woodpeckerci/plugin-s3
      settings:
-+      tags: ${CI_COMMIT_TAG}
++      target: /target/${CI_COMMIT_TAG}
 ```
 
 ## String Operations
@@ -208,18 +208,18 @@ Example variable substitution with substring:
 
 ```diff
  steps:
-   - name: docker
-     image: woodpeckerci/plugin-kaniko
+   - name: s3
+     image: woodpeckerci/plugin-s3
      settings:
-+      tags: ${CI_COMMIT_SHA:0:8}
++      target: /target/${CI_COMMIT_SHA:0:8}
 ```
 
 Example variable substitution strips `v` prefix from `v.1.0.0`:
 
 ```diff
  steps:
-   - name: docker
-     image: woodpeckerci/plugin-kaniko
+   - name: s3
+     image: woodpeckerci/plugin-s3
      settings:
-+      tags: ${CI_COMMIT_TAG##v}
++      target: /target/${CI_COMMIT_TAG##v}
 ```

docs/docs/20-usage/51-plugins/51-overview.md

@@ -23,7 +23,7 @@ steps:
       template: config/k8s/service.yaml
 ```
 
-Example pipeline using the Docker and Prettier plugins:
+Example pipeline using the Prettier and S3 plugins:
 
 ```yaml
 steps:
@@ -37,10 +37,11 @@ steps:
     image: woodpeckerci/plugin-prettier
 
   - name: publish
-    image: woodpeckerci/plugin-kaniko
+    image: woodpeckerci/plugin-s3
     settings:
-      repo: foo/bar
-      tags: latest
+      bucket: my-bucket-name
+      source: some-file-name
+      target: /target/some-file
 ```
 
 ## Plugin Isolation