Add edit link to index page

Author: ttuff

docs/index.md

@@ -4,6 +4,8 @@ title: Project Sprint — 3-Day Science Showcase
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+<p style="text-align: right;"><a href="https://github.com/CU-ESIIL/Project_group_OASIS/edit/main/docs/index.md" title="Edit this page">✏️</a></p>
+
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