fix: Replace repo for package name

[joshlynchONS]

Summary

Replace the use of repo_name for project name and package name in directory. This allows the user to create a project with a separate package and project name.

Checklists

This pull/merge request meets the following requirements:

• code runs
• developments are ethical and secure
• you have made proportionate checks that the code works correctly
• you have tested the build of the template
• test suite passes
• minimum usable documentation written in the docs folder

Comments have been added below around the incomplete checks.

[codecov-commenter]

Codecov Report

Merging #86 (0b9cc66) into main (df58ec8) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   59.25%   59.25%           
=======================================
  Files           4        4           
  Lines          54       54           
=======================================
  Hits           32       32           
  Misses         22       22           

Impacted Files	Coverage Δ
...(' ', '_').replace('-', '_') }}/example_config.yml	66.66% <ø> (ø)
...ace('-', '_') }}/example_modules/example_module.py	4.54% <ø> (ø)

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