docs(website): add documentation of exported interfaces to website docs

website/src/markdown/docs/api/component-props.md

@@ -71,3 +71,9 @@ import ReactFlow from 'react-flow-renderer';
 ### Keys
 - `deleteKeyCode`: default: `8` (backspace)
 - `selectionKeyCode`: default: `16` (shift)
+
+**Typescript:** The interface of the ReactFlow Prop Types are exported as `ReactFlowProps`. You can use it in your code as follows:
+
+```javascript
+import { ReactFlowProps } from 'react-flow-renderer';
+```

website/src/markdown/docs/api/components/background.md

@@ -29,3 +29,5 @@ const FlowWithBackground = () => (
 - `color`: string - the color of the dots or lines - default: `#81818a` for dots, `#eee` for lines
 - `style`: css properties
 - `className`: additional class name
+
+**Typescript:** The interface of the Background Prop Types are exported as `BackgroundProps`.

website/src/markdown/docs/api/components/controls.md

@@ -23,3 +23,5 @@ const FlowWithControls = () => (
 - `showInteractive`: boolean - default: true
 - `style`: css properties
 - `className`: additional class name
+
+**Typescript:** The interface of the Controls Prop Types are exported as `ControlProps`.

website/src/markdown/docs/api/components/minimap.md

@@ -34,3 +34,5 @@ const FlowWithMiniMap = () => (
 - `maskColor`: string
 - `style`: css properties
 - `className`: additional class name
+
+**Typescript:** The interface of the MiniMap Prop Types are exported as `MiniMapProps`.

website/src/markdown/docs/api/handle.md

@@ -28,6 +28,8 @@ const targetHandleWithValidation = (
 - `style`: css properties
 - `className`: additional class name
 
+**Typescript:** The interface of the Handle Prop Types are exported as `HandleProps`.
+
 ### Validation
 
 The handle receives the additional class names `connecting` when the connection line is above the handle and `valid` if the connection is valid. You can find an example which uses these classes [here](/examples/validation).