Allow the user to delete the next steps and solutions fields in a single tap

[nbiton]

Suggestion: When each field is focused on, all the input text is marked as highlighted so the next character would delete it all.

[franck-boullier]

See also https://github.com/unee-t/frontend/issues/505#issuecomment-424578922: This is where the latest design for the "Next Step" and "Solution" Fields is documented

[franck-boullier]

For the records:

The improved designs of how we can udpate the "Solution" and "Next Steps" already exists in Figma. We should keep that in mind when we work on this!

and

[ongdominic]

Here is the solution for this. Details are in figma