Reformat, update to KordEx v2

[gdude2002]

This PR contains the following changes:

• Bump version to 0.8 (hopefully I did this right, it's not clear how you expect that to happen)
• Rewrite the build script using the KordEx Gradle plugin
  • Remove KordEx and KTor dependencies as they're provided by the KordEx plugin
  • Remove repositories as they're provided by the KordEx plugin
  • Remove application plugin, jvm target and jar configuration as they're provided by the KordEx plugin
  • Remove the use of Gradle toolchains as that tends to cause far more problems than it solves
  • Move libs.versions.toml to gradle/ as that's the standard now, and remove version catalogue configuration from settings.gradle.kts
  • Centralise plugin versions in settings.gradle.kts
  • Update documentation generator, which has updated your commands documentation
  • Update Logback
  • Update Gradle Wrapper to 8.10
• Update to Kotlin 2.0.20-RC2
• Update to KordEx v2, with data collection set to "Minimal"
• Remove the "about" command and configure the KordEx bundled "about" command with the same options
• Remove CIO KTor dependency, allowing KTor to pick it automatically (as Kord uses it)
• Fix the v1 migration (which didn't create the collection it wanted to access)
• Add .editorconfig from LilyBot, reformat the project, and tell Detekt not to yell about tabs
• Add assets/, config/ and data/ to gitignore
• Update workflows to use Java 21
• Add a workflow for pull requests, so you know that they build

I think that about covers it!

[NotJansel]

builds fine and else lgtm, merging this