feat: simcenter apps, labeled "(SimCenter)" (#266)

## What Did You Change?

Added SimCenter apps to list of Simulation apps, per @cockerilltim.

## Do You Want Support (syntax, design, etc)?

**Yes.** Pick an option:
* integrated
* grouped (under SimCenter)

## Any Reference Material Worth Sharing?

| integrated | grouped |
| - | - |
| <img width="900" height="470" alt="alphabetical, integrated"
src="https://github.com/user-attachments/assets/8b938b2f-4e75-4cd8-b177-c0b4492dc9ee"
/> | <img width="900" height="470" alt="alphabetical, grouped"
src="https://github.com/user-attachments/assets/5c2faa00-ae55-4ecc-9c1b-57e30bf429ad"
/> |

Author: wesleyboar

mkdocs.yml

@@ -95,7 +95,14 @@ nav:
       - IN-CORE: tools/simulation/in-core.md
       - LS-DYNA: tools/simulation/lsdyna.md
       - OpenFoam: tools/simulation/openfoam.md
-      - OpenSees : tools/simulation/opensees/opensees.md
+      - OpenSees: tools/simulation/opensees/opensees.md
+      - SimCenter:
+        - EE-UQ: https://nheri-simcenter.github.io/EE-UQ-Documentation/
+        - Hydro-UQ: https://nheri-simcenter.github.io/Hydro-Documentation/
+        - PBE: https://nheri-simcenter.github.io/PBE-Documentation/
+        - quoFEM: https://nheri-simcenter.github.io/quoFEM-Documentation/
+        - R2D: https://nheri-simcenter.github.io/R2D-Documentation/
+        - WE-UQ: https://nheri-simcenter.github.io/WE-UQ-Documentation/
     - Analysis:
       - Jupyter: tools/jupyterhub.md
       - MATLAB: analysis/matlab.md