feat(ui): Improve toast error messages

[mtiller]

This just modified the error handling on several axios calls
to extract the underlying error embedded in the HTTP response
so it is visible to the user.

Sorry for all the changes. The only real changes here are to the
toast calls. It appears that this project doesn't include
a .prettierrc file to standardize prettier settings. As s result, you'll
end up with this situation where all the files get formatted according
to different settings. You might want to consider adding a .prettierrc
file to ensure consistent formatting (at least among VS Code users).

This closes #244

[gempain]

Thanks so much for the changes ! Is there a way to rollback the changes made by prettier ? I would happily add a prettier config and also use it across the app, but I'd do this in another MR to avoid mixing things. Would you be able to configure a .prettierrc to automatically rollback the formatting changes ? If it's not possible I'll go through the review but there's indeed quite a lot of changes 😄

[mtiller]

The problem is that I don't know what that .prettierrc should look like. I don't know what settings were used by all the contributors to meli. If we had such a .prettierrc file, all I'd need to do is resave all these files and push one more commit to the end of this branch. Do you know what editor was used for this and what formatting standards were followed?

[mtiller]

I'll resubmit this without all the formatting changes. Just ignore this PR. I'll make a fresh one.

[gempain]

@mtiller don't worry I can still review 😄 Regarding the prettier file to use, all I ask for is:

• 2 spaces indentation
• single quotes
  I can setup a .prettierrc and provide it to you. Just need a bit of time.

[mtiller]

There is now a much cleaner PR, #253.