Docs: dynamic theme tool not working

### Current behaviour
To generate theme colour, the provided tool is unable to get text input for hex value. Drop down is not working properly.

### Expected behaviour
Dropdown should let you select whatever colour needed, also we should be able to enter hex code.

### How to reproduce?
Try to specify colour by clicking on the right side of any colour

### Preview

### What have you tried so far?

### Your Environment

| software | version
| --------------------- | -------
| ios | x
| android | x
| react-native | x.x.x
| react-native-paper | x.x.x
| node | x.x.x
| npm or yarn | x.x.x
| expo sdk | x.x.x

Start by reproducing the issue in the dynamic theme tool, then locate the implementation of its colour dropdown and hex-value input. Done means selecting a colour works from the dropdown and entering a hex code generates the expected theme colour.

Written by the indexing model from the issue text.