Merge pull request #46 from bids-standard/fix/link

Fix link in index

src/index.md

@@ -4,6 +4,6 @@ This site serves as an online resource to see the current state of the
 Brain Imaging Data Structure (BIDS) specification. It contains information
 about the core specification, as well as many modality-specific extensions.
 
-To get started, [check out the introduction](01-introduction). If you'd like
+To get started, [check out the introduction](01-introduction.md). If you'd like
 more information on how to adapt your own datasets to match the BIDS
-specification, we recommend exploring the [bids-specification starter kit](https://github.com/bids-standard/bids-starter-kit).
+specification, we recommend exploring the [bids-specification starter kit](https://github.com/bids-standard/bids-starter-kit).