[Travel demo] Remove 'Text and External Image' component

When adding a new component within an existing page, in the dropdown menu our external assets are described as 'Text and External Image'.

The 'Text and External Image' component was created as our travel demo project did not support external assets. The newer version of travel demo does support external assets, so this component is no longer needed. 

Desired behaviour 

• Remove the 'Text and External Image' component