Update Sbxh parser

[Bartuzen]

Made some improvements to Sbxh parser.

• Added site's mirror domain.
• Chapters are now fetched from all paginated chapter list pages. Previously, only the chapters visible on the currently loaded page were fetched.
• Rather than using a broad selector to get chapter title and parsing it, I instead directly fetched the title which gives a better result.
• Chapter title now always includes both chapter title and chapter count. Sometimes both chapter count and title can be same which results in a title like 1화 - 1화, but since title format isn't consistent, I kept it like this.

[gamebeaker]

@Bartuzen do you want to add yourself to the "contributors" section of packages.json and updated the "Credits" section of readme.md with your name?

Just a question out of curiosity did you use the wiki guide https://github.com/dteviot/WebToEpub/wiki/Developer-guide?

[Bartuzen]

Sure, let me add my name real quick.
For the second question, no. I didn't check out wiki too much and didn't realize there was such a page.

[dteviot]

@Bartuzen

Apologies, but due to other MRs that got in first, can you rebase and fix package.json please.

[dteviot]

Thank you for your contribution.