Standardize script names

[Victoria-DR]

What issue is this solving?

Closes #329

Description

Changed all names of multi-word scripts to use dashes between each word. Any references or uses of the scripts in other files were updated to reflect the new convention.

Also updated our license copyright statement to the current year.

Any helpful knowledge/context for the reviewer?

• Is a re-seeding of the database necessary? No
• Any new dependencies to install? No
• Any special requirements to test? No
  • (e.g., admin perms, alt account, etc.)

Please make sure you've attempted to meet the following coding standards

• [x] Code has been tested and does not produce errors
• [x] Code is readable and formatted
• [x] There isn't any unnecessary commented-out code

[Victoria-DR]

Have the database ones been tested after the name change?

Yes, I've tested them and they all work fine.

I would like to hold off on this change until after we've deployed the slash commands, just to keep from adding another change in the mix, but after that this should be fine. Assuming the database commands work, we'll also want to update the documentation here: https://github.com/CodecademyCommunity/codecademy-discord-bot/wiki/Database-Utilities once this is merged

Sounds good, after the slash commands are deployed we can try merging this in and updating the wiki.

[Victoria-DR]

Update: the relevant wiki articles have been changed and updated to use the new dash-between-words format.