Fix(maangchi): use regex string to find ingredients header

[oahnh]

Resolves #1310

Utilizes a regex string to find ingredient headers matching patterns like "Ingredients (serves n to m)"

Example recipes

• https://www.maangchi.com/recipe/gimbap
• https://www.maangchi.com/recipe/budae-jjigae
• https://www.maangchi.com/recipe/maeuntang

Unittests passing:

Any feedback or discussion is appreciated!

[jknndy]

This seems reasonable to me!

If you add Resolves #1310 to the body of the PR it will automatically when this is merged.

[oahnh]

I realized both of the commits got squashed into the formatting commit 🤦🏽 I updated per your suggestion in the chore: formatting commit

[jayaddison]

Looks good to me too - thank you for contributing, @oahnh!