Could we use a .txt file instead of .scm

[mantagen]

Not sure why we're using a .scm file extension, extra unknowns tend to distract from the learning objectives.
Might be clearer to use a file extension that people are familiar with.

My suggestion would be to change the file exension to .txt.

[bradreeder]

Fine by me @mantagen , happy to review if you make a PR.

[sunuwars]

This issue seems to have been resolved, @mantagen , @bradreeder and @lucymk are all happy for
this issue to be closed?

[sunuwars]

Oops sorry, just noticed there is grep.scm file in lesson 1/public folder. Agree this issue should be left open 😓