chore: change heuristic names and rules

[art1f1c3R]

Summary

Following the addition of the MINIMAL_CONTENT, UNSECURE_DESCRIPTION, and STUB_NAME heuristics, some refactoring to their use in the ProbLog rules has been done to ensure no false negatives occur.

Description of changes

To better reflect their use and intention, the following names of heuristics were changed:

• MINIMAL_CONTENT --> TYPE_STUB_FILE
• UNSECURE_DESCRIPTION --> PACKAGE_DESCRIPTION_INTENT

Some keywords were also removed from the UNSECURE_DESCRIPTION heuristic to avoid missing packages which, whilst they may be test packages, are still should be detected by Macaron. Some unit tests have also been modified to reflect these changes, and avoid redundant pathway tests. Updates to documentation such as the README.md are also included.

Checklist

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