fix: remove example pipe (#18224)

ui/src/notebooks/pipes/Example/index.ts

@@ -1,14 +0,0 @@
-import {register} from 'src/notebooks'
-import ExampleView from './view'
-import './style.scss'
-
-let counter = 0
-
-register({
-  type: 'example',
-  component: ExampleView,
-  button: 'Example Adding',
-  initial: () => ({
-    text: 'Example Text ' + counter++,
-  }),
-})

ui/src/notebooks/pipes/Example/style.scss

@@ -1,18 +0,0 @@
-.pipe-example {
-    .notebook-panel--header {
-        transition: opacity 0.2s;
-        opacity: 0;
-    }
-
-    &:hover {
-        .notebook-panel--header {
-            opacity: 1;
-
-        }
-    }
-
-    h1 {
-        margin: 0;
-        padding: 1em 0;
-    }
-}

ui/src/notebooks/pipes/Example/view.tsx

@@ -1,12 +0,0 @@
-import React, {FC} from 'react'
-import {PipeProp} from 'src/notebooks'
-
-const ExampleView: FC<PipeProp> = ({data, Context}) => {
-  return (
-    <Context>
-      <h1>{data.text}</h1>
-    </Context>
-  )
-}
-
-export default ExampleView