Mangadex - Allow www prefix and page suffix

[0x1f595]

Category

This change is exactly one of the following (please change [ ] to [x]) to indicate which:

• [x] a bug fix

Description

This updates the Mangadex ripper to make it a bit more relaxed on what URLs it considers valid and can rip. It now allows a "www" prefix on the URL, and correctly rips whole chapters when a page URL within a chapter is given.

Testing

Required verification:

• [x] I've verified that there are no regressions in mvn test (there are no new failures or errors).
• [x] I've verified that this change works as intended.
  • [x] Downloads all relevant content.
  • [x] Downloads content from multiple pages (as necessary or appropriate).
  • [x] Saves content at reasonable file names (e.g. page titles or content IDs) to help easily browse downloaded content.
• [x] I've verified that this change did not break existing functionality (especially in the Ripper I modified).

Optional but recommended:

• [x] I've added a unit test to cover my change.

[metaprime]

Tried merging this PR together with main but it looks like the implementation calls an API that maybe doesn't work anymore, so a bigger fix for this ripper is needed.

See #2091