Add strikethrough implementation

[joemoongit]

This works similarly to the addUnderline() method Here is an example when you pass text containing <del> tags into text() pdf-strikethrough.pdf Please let me know if you have any suggestions

[julianhille]

Please add del element to tests/TestMaterials/recipe/text.html

[joemoongit]

Ok, completed

[julianhille]

Linting fails. Should i take care or do you?

[joemoongit]

I ran auto format for commit 41be2f8 (Shift + Option + F on Mac, VSCode)

I ran npx prettier --write for commit 8b2e1e1

[julianhille]

Thanks!