fix: SEO-1 (#29)

nodes/utilities/unique-id/README.md

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+---
+hide_title: true
+hide_table_of_contents: true
+title: Unique Id
+---
+
+<##head##>
+
+# Unique Id
+
+This node generates a unique ID, something that is very useful when storing data in a backend like Noodl Cloud Services.
+
+<div className="ndl-image-with-background l">
+
+![](/nodes/utilities/unique-id/unique-id.png)
+
+</div>
+
+Generating a unique ID for every entity in the database means that it can easily be retrieved and referenced, no matter what the content is.
+
+<##head##>
+
+## Inputs
+
+| Signal                                  | Description                           |
+| --------------------------------------- | ------------------------------------- |
+| <span className="ndl-signal">New</span> | Set the Id output to a new unique id. |
+
+## Outputs
+
+| Data                                 | Description                            |
+| ------------------------------------ | -------------------------------------- |
+| <span className="ndl-data">Id</span> | The current id generated by this node. |