issue templates: add generic option & more links

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,14 @@
+blank_issues_enabled: false
+contact_links:
+- name: Announcement
+  url: https://www.ccpsynerbi.ac.uk/events/petric/
+  about: CCP SyneRBI website Challenge announcement
+- name: Wiki
+  url: https://github.com/SyneRBI/PETRIC/wiki
+  about: Participation details
+- name: Leaderboard
+  url: https://tomography.stfc.ac.uk
+  about: Current rankings
+- name: Discord
+  url: https://discord.gg/Ayd72Aa4ry
+  about: Responsive chat with the organisers and other participants

.github/ISSUE_TEMPLATE/issue.md

@@ -0,0 +1,4 @@
+---
+name: Bug or Enhancement
+about: Unexpected behaviour, feature request, or documentation suggestion
+---

.github/ISSUE_TEMPLATE/participate.yml

@@ -21,7 +21,7 @@ body:
   attributes:
     label: Terms
     options:
-    - label: I want to be eligible for prizes, and will make my code public after the challenge ends & after any of my pending publications.
-      required: true
-    - label: I agree to play by the rules of the competition.
+    - label: (Optional) I want to be eligible for prizes, and will make my code public after the challenge ends.
+      required: false
+    - label: I agree to abide by the [rules](https://github.com/SyneRBI/PETRIC/wiki).
       required: true

README.md

@@ -1,10 +1,14 @@
 # PETRIC: PET Rapid Image reconstruction Challenge
 
-[![website](https://img.shields.io/badge/website-announcement-green)](https://www.ccpsynerbi.ac.uk/events/petric/) [![wiki](https://img.shields.io/badge/details-wiki-blue)](https://github.com/SyneRBI/PETRIC/wiki) [![Leaderboard](https://img.shields.io/badge/leaderboard-orange)](https://tomography.stfc.ac.uk)
+[![website](https://img.shields.io/badge/announcement-website-purple?logo=workplace&logoColor=white)](https://www.ccpsynerbi.ac.uk/events/petric/)
+[![wiki](https://img.shields.io/badge/details-wiki-blue?logo=googledocs&logoColor=white)](https://github.com/SyneRBI/PETRIC/wiki)
+[![register](https://img.shields.io/badge/participate-register-green?logo=ticktick&logoColor=white)](https://github.com/SyneRBI/PETRIC/issues/new/choose)
+[![leaderboard](https://img.shields.io/badge/rankings-leaderboard-orange?logo=tensorflow&logoColor=white)](https://tomography.stfc.ac.uk)
+[![discord](https://img.shields.io/badge/chat-discord-blue?logo=discord&logoColor=white)](https://discord.gg/Ayd72Aa4ry)
 
 ## Participating
 
-The organisers will provide GPU-enabled cloud runners which have access to larger private datasets for evaluation. To gain access, you must [register by opening an issue](https://github.com/SyneRBI/PETRIC/issues/new/choose). The organisers will then create a private team submission repository for you.
+The organisers will provide GPU-enabled cloud runners which have access to larger private datasets for evaluation. To gain access, you must [register](https://github.com/SyneRBI/PETRIC/issues/new/choose). The organisers will then create a private team submission repository for you.
 
 ## Layout