add pipes around readme links

README.md

@@ -5,7 +5,7 @@ The config directory is a subtree, so all commits to it should only involve file
 
 -->
 
-[Download](https://gitlab.com/bindrpg/core/pipelines) | [Wiki](https://gitlab.com/bindrpg/core/-/wikis/home)
+| [Download](https://gitlab.com/bindrpg/core/pipelines) | [Wiki](https://gitlab.com/bindrpg/core/-/wikis/home) |
 
 Bind is a fantasy tabletop RPG.  It's a free-as-in-freedom project, meaning that anyone can grab a copy of the source document and improve the rules, change the wording, add images, and then print it out, just like the original.