Add Multiple Examples to Video Showcase (#1794)

* Update the preview image

* add new example

* add showcase for Gravitational attraction

* add Multiple gravitational attractors

* add Mutual gravitational attraction with impulse

* add showcase with name Wheel of fortune

* add Cannonball shooting for showcasing

* add Applying forces to a ball with mass to showcase

* add Solar System Simulation to showcase

* add Fluid dynamics to 98-quadtree showcase

* add Fluid dynamics to 132-fluid-simulation showcase

* add Brownian motion to 184-elastic-collisions showcase

* add Basic Collision to 184-elastic-collisions showcase

* add Multiple gravitational attractors to 56-attraction-and-repulsion-forces showcase

* add Mutual gravitational attraction with impulse to 56-attraction-and-repulsion-forces showcase

* add Simple Breakout Game to 67-pong showcase

* remove duplicated

* remove duplicated

* remove duplicated

Author: vislupus

content/videos/challenges/132-fluid-simulation/showcase/contribution4.json

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+{
+  "title": "Fluid dynamics",
+  "author": {
+    "name": "Nikola Bozhinov",
+    "url": "https://github.com/vislupus"
+  },
+  "url": "https://vislupus.github.io/p5-simulations/fluid_dynamics.html",
+  "submittedOn": "2025-01-10"
+}

content/videos/challenges/132-fluid-simulation/showcase/contribution4.png

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+{
+  "title": "Brownian motion",
+  "author": {
+    "name": "Nikola Bozhinov",
+    "url": "https://github.com/vislupus"
+  },
+  "url": "https://vislupus.github.io/p5-simulations/brownian_motion.html",
+  "submittedOn": "2025-01-10"
+}

content/videos/challenges/184-elastic-collisions/showcase/contribution1.json

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+{
+  "title": "Basic Collision",
+  "author": {
+    "name": "Nikola Bozhinov",
+    "url": "https://github.com/vislupus"
+  },
+  "url": "https://vislupus.github.io/p5-simulations/collision.html",
+  "submittedOn": "2025-01-10"
+}

content/videos/challenges/184-elastic-collisions/showcase/contribution1.png

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+{
+  "title": "Multiple gravitational attractors",
+  "author": {
+    "name": "Nikola Bozhinov",
+    "url": "https://github.com/vislupus"
+  },
+  "url": "https://vislupus.github.io/p5-simulations/multiple_gravitational_attractors.html",
+  "submittedOn": "2025-01-10"
+}

content/videos/challenges/184-elastic-collisions/showcase/contribution2.json

@@ -0,0 +1,9 @@
+{
+  "title": "Mutual gravitational attraction with impulse",
+  "author": {
+    "name": "Nikola Bozhinov",
+    "url": "https://github.com/vislupus"
+  },
+  "url": "https://vislupus.github.io/p5-simulations/mutual_gravitational_attraction.html",
+  "submittedOn": "2025-01-10"
+}