Update wiki links to new location (Nexus/wiki -> AutoGPT/wiki)

.github/ISSUE_TEMPLATE/1.bug.yml

@@ -16,7 +16,7 @@ body:
         [discussions]: https://github.com/Significant-Gravitas/AutoGPT/discussions
         [#tech-support]: https://discord.com/channels/1092243196446249134/1092275629602394184
         [existing issues]: https://github.com/Significant-Gravitas/AutoGPT/issues?q=is%3Aissue
-        [wiki page on Contributing]: https://github.com/Significant-Gravitas/Nexus/wiki/Contributing
+        [wiki page on Contributing]: https://github.com/Significant-Gravitas/AutoGPT/wiki/Contributing
 
   - type: checkboxes
     attributes:

.github/ISSUE_TEMPLATE/2.feature.yml

@@ -5,7 +5,7 @@ body:
   - type: markdown
     attributes:
       value: |
-        First, check out our [wiki page on Contributing](https://github.com/Significant-Gravitas/Nexus/wiki/Contributing)
+        First, check out our [wiki page on Contributing](https://github.com/Significant-Gravitas/AutoGPT/wiki/Contributing)
         Please provide a searchable summary of the issue in the title above ⬆️.
   - type: checkboxes
     attributes:

.github/PULL_REQUEST_TEMPLATE.md

@@ -10,7 +10,7 @@
 
 <!--
 Check out our contribution guide:
-https://github.com/Significant-Gravitas/Nexus/wiki/Contributing
+https://github.com/Significant-Gravitas/AutoGPT/wiki/Contributing
 
 1. Avoid duplicate work, issues, PRs etc.
 2. Also consider contributing something other than code; see the [contribution guide]