Add New source: QuestionableContent.net

[HealsCodes]

This PR adds a source for Questionable Content.net - a web comic running for 20 odd years and still going.

Note: Currently the chapters do not have an upload-date as those are only ever available for the current year and I'd rather not include any than having to offer a rough guess on a date.

Checklist:

• [x] Updated source's version for individual source changes
• [x] Updated all sources' versions for template changes (NA)
• [x] Set appropriate nsfw value
• [x] Did not change id even if a source's name or language were changed
• [x] Tested the modifications by running it on the simulator or a test device

[HealsCodes]

I admit, I forgot to run clippy in linting mode before pushing my initial version - should be clean now. buld.sh also has the executable bit set as well, probably an oversight from using an old version of aidoku-cli at first and locally just running via zsh ./build.sh ^^