Remove redundant Negishi link from navbar.

Author: Guangzhen-Jin

mkdocs.yml

@@ -200,7 +200,6 @@ nav:
       - Compiling Source Code: userguides/hammer/compile.md
       - Running Jobs: userguides/hammer/run_jobs/index.md
       - Frequently Asked Questions: userguides/hammer/faqs.md
-    - Negishi: https://www.rcac.purdue.edu/knowledge/negishi
     - Rossmann: https://www.rcac.purdue.edu/knowledge/rossmann
     - Weber: https://www.rcac.purdue.edu/knowledge/weber
   - Storage User Guides: