Add Fenrir Translations source

[kardigun]

No description provided.

[dipu-bd]

The template looks very similar to MadaraTemplate. I have merged this since it is working, but can you check if using the template works.

from lncrawl.templates.madara import MadaraTemplate

class FenrirTranslationsCrawler(MadaraTemplate):
    base_url = ["https://fenrirtranslations.com/"]

[kardigun]

You're right, this could be implemented based on MadaraTemplate with some adjustment for chapters selection to skip paid chapters (or actually chapters linking to the novel page itself).
Please tell me if using the template is preferred, I would then create another PR to fix.

[dipu-bd]

yes, using a template is preferred. it is easier for maintenance