update broken readme links

.github/workflows/main.yml

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-on:
-  push:
-    branches:
-      - master
+on: workflow_dispatch
 
 env:
   EPUBCHECK_VERSION: "4.2.6"

README.md

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 # Harry Potter and the Nightmares of Futures Past eBook
 
-An eBook/PDF version of *[Harry Potter and the Nightmares of Futures Past](https://www.fanfiction.net/s/2636963/43/Harry-Potter-and-the-Nightmares-of-Futures-Past)* by Matthew Schocke.
-(Note that fanfiction.net has taken the story down as of April 2019, and could not be reached for comment.)
+An eBook/PDF version of _[Harry Potter and the Nightmares of Futures Past](https://www.royalroad.com/fiction/32542/harry-potter-and-the-nightmares-of-futures-past)_ by Matthew Schocke.
 
 This version includes up to chapter 43, plus two authorised one-shots by other authors:
 
-- *[G for Ginevra](https://www.fanfiction.net/s/10213764/1/G-for-Ginevra)*, by Peach Wookiee
-- *[A Night at the Burrow: A Fan Short](https://www.fanfiction.net/s/4019762/1/A-Night-at-the-Burrow-A-Fan-Short)*, by Worfe
+- _[G for Ginevra](https://www.fanfiction.net/s/10213764/1/G-for-Ginevra)_, by Peach Wookiee
+- _[A Night at the Burrow: A Fan Short](https://www.fanfiction.net/s/4019762/1/A-Night-at-the-Burrow-A-Fan-Short)_, by Worfe
 
 It also fixes a number of typographical errors.
-
-Discuss this eBook on the Viridian Dreams [forum thread](http://www.viridiandreams.net/forum/viewtopic.php?f=4&t=5545&p=125238).