Added missing links

Author: t-redactyl

src/content/pages/guidelines.mdx

@@ -86,14 +86,14 @@ cables on the podiums, Murphy has a special nose for materials needed during liv
 We want everyone to feel welcome and comfortable at EuroPython. As such, it’s important that your
 session is accessible for all of your audience members.
 
-In order to make accessible slides, you can check the following guidelines. In general, please
+In order to make accessible slides, you can check the [following guidelines](https://www.gov.wales/how-create-accessible-powerpoint-presentations). In general, please
 consider the following:
 
 * Use a simple, sans serif font with enough spacing between letters, with at least an 18-point font
   size. Examples include Calibri, Franklin Gothic Book, Lucida Sans and Segoe UI.
 * Use enough spacing between lines of text, and limit the amount of text per slide.
 * Use high-contrast colours, but please avoid red-green combinations. Try to use an off-white or
-  cream background instead of bright white. This tool can help to select accessible colour
+  cream background instead of bright white. [This tool](https://github.com/alan-turing-institute/distinctipy) can help to select accessible colour
   combinations.
 * Avoid using images with text that might be hard to read.