courses-ko update

[maldron0309]

What does this PR do?

Add resource(s) | Remove resource(s) | Add info | Improve repo
Improve repo

For resources

Description

I've revised authors to match the guide, added new lessons, and deleted lessons that no longer work.

Why is this valuable (or not)?

I've modified it to match the guide.

How do we know it's really free?

yes

For book lists, is it a book? For course lists, is it a course? etc.

course

Checklist:

• Read our contributing guidelines.
• Search for duplicates.
• Include author(s) and platform where appropriate.
• Put lists in alphabetical order, correct spacing.
• Add needed indications (PDF, access notes, under construction).
• Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-ko.md
  110:1-112:3  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint
249:1-251:106  warning  Alphabetical ordering: swap l.250 and l.249                            alphabetize-lists  remark-lint
249:1-251:106  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/courses/free-courses-ko.md
249:1-251:106  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[eshellman]

This is a big improvement!
It's easier to review if you make one type of change at a time. In this case everything looks fine except I think we need to keep the access note, and when the course platform is other than youtube, we want to give the name of the platform in parentheses:
* [title](link) - instructor or creator (platform if not youtube) (access note if needed)