Make Learning Directory README files uniform

[JamieBort]

task:
Make Learning Directory README files uniform, meaning make them have the same headings in the same order with the same phrasing under each heading.

To this end, look into a

• bash/git command that searches for

  • all the (sub-)directories without a readme file.
  • and all the (sub-)directories who's readme file differs from the template.

• bash command that can add the missing

  • headings
  • starter phrases such as
    • <!-- The purpose of this directory is to [...]. -->
    • and This directory houses information about [name_of_the_directory_that_this_readme_file_is_in].

See also a bullet under https://github.com/JamieBort/Learning-Directory/tree/master/Languages/Bash#use-cases

Possibly related: #196

Possibly related: https://github.com/JamieBort/Digital-Knowledge-Base/blob/main/journals/2024_08_06.md#later-create-a-keyboard-shortcut-for-readmemd-files-that-are-used-in-each-sub-directory-of-the-professional-development-learning-directory-66b27b23-e610-4892-8bca-702431926e9d-repo