1. Update links
2. Make code style match other jQuery projects
3. Fix build & test instructions.
4. Don't mention Karma, we don't use it anymore

Fixes gh-185

Changes:
1. Don't commit the minified file to the `main` branch.
2. Move the source file to `src/`.
3. Compute the version during the build.
4. Add a `release-it`-based release process.

Closes gh-250

Changes:
1. Drop support for IE <11.
2. Drop support for older jQuery; only support newest versions from the 1.x
   & 2.x lines and 3.6.4 or newer.
3. Drop support for non-wheel backing native events.
4. Drop the `mousewheel` and `unmousewheel` shorthands.
5. Move `jquery` from `dependencies` to `peerDependencies` & `devDependencies`.

Closes gh-252