Improve "no platform error message"

[Anton-4]

We should show the user the file that we got to avoid confusion like here.

Current version:

── NO PLATFORM in main.roc ──────────────

I could not find a platform based on your input file.

Does the module header have an entry that looks like this?

    app [main] { pf: platform "…path or URL to platform…" }

Tip: The following part of the tutorial has an example of specifying a
platform:  <https://www.roc-lang.org/tutorial#building-an-application>

My suggestion:

── NO PLATFORM in main.roc ──────────────

I could not find a platform based on your input file at <PATH_OF_FILE>:
    <first 10 lines of file followed by ...>

Does the module header have an entry that looks like this?

    app [main] { pf: platform "…path or URL to platform…" }

Tip: The first line in this file shows how you can specify a platform: 
<https://github.com/roc-lang/examples/blob/main/examples/HelloWorld/main.roc>