index: Update GSoC links

index.md

@@ -20,7 +20,7 @@ systems such as Windows in the near future.
 ## Important links
 
 * Source code: <https://gitlab.freedesktop.org/monado/monado>
-* GSoC 2022: <https://monado.freedesktop.org/gsoc-2022.html>
+* GSoC 2022: [Proposal guide](https://monado.freedesktop.org/gsoc-proposal-guide.html) and [project ideas](https://monado.freedesktop.org/gsoc-2022.html).
 * Discord server: <https://discord.gg/8RkJgRJ>
 * IRC channel: [#monado](https://webchat.oftc.net/?channels=monado) on
   [OFTC](https://oftc.net/)
@@ -30,7 +30,8 @@ systems such as Windows in the near future.
 We are happy to announce that Monado have been selected for
 [Google Summer of Code 2022](https://summerofcode.withgoogle.com/). Project
 and additional information is available on the Monado
-[GSoC page](https://monado.freedesktop.org/gsoc-2022.html).
+[proposal guide](https://monado.freedesktop.org/gsoc-proposal-guide.html) and
+[project ideas](https://monado.freedesktop.org/gsoc-2022.html) page.
 
 ## Highlights