Asylum updates on Saturdays, but what about all that fun stuff in between? If you want to read the story, just the story, and nothing but the story, start at the prologue and use the navigation links at the immediate bottom of the text. If you want to wander through story and updates as they come, the previous/next buttons that are built into the website are the way to go. The bonus materials is usually related to the content of the main entries, for a richer read, but the story reads just fine without them.
If you passed them over during your reading of the story, all the supplemental can be found The Appendix. Read entries on things like deities and cultural references, translations of foreign phrases used throughout, and other world building tidbits that we thought might prove useful.