fix(docs): Created guide to install capacitor in your cluster. (#35602)

Created a short guide on how to set up capacitor. I have this
configuration working in my cluster now and I think it could be useful
for people to know.

**Description**
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⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

- [ ] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code
- [x] 📜 Documentation Changes

**🧪 How Has This Been Tested?**
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This is currently running in my cluster in this configuration now.
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**📃 Notes:**
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**✔️ Checklist:**

- [ ] ⚖️ My code follows the style guidelines of this project
- [ ] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [x] 📄 I have made changes to the documentation
- [] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [] ⬆️ I increased versions for any altered app according to semantic
versioning
- [x] I made sure the title starts with `feat(chart-name):`,
`fix(chart-name):`, `chore(chart-name):`, `docs(chart-name):` or
`fix(docs):`

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

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---------

Signed-off-by: TJ <55514551+nerddotdad@users.noreply.github.com>

website/src/content/docs/guides/fluxcd/capacitor.md

@@ -0,0 +1,118 @@
+---
+sidebar:
+  order: 2
+title: FluxCD Capacitor
+---
+
+:::caution[Disclaimer]
+
+This guide isnt covered by the Support Policy and is considered more advanced.
+If you face issues feel free to open a thread in the appropiate Channel in our Discord server.
+
+:::
+
+:::note[Note]
+
+[Capacitor](https://fluxcd.io/blog/2024/02/introducing-capacitor/) was created by FluxCD the repo and Kustomization file were pulled from that link. Please reference that document to gain more contenxt and understanding of how it works.
+
+:::
+
+## Prerequisites
+
+- Having a running Kubernetes cluster
+- Bootstrapped fluxcd
+- Knowledge on how to add charts/kubernetes resources with fluxcd
+- Usage of an ingress to make the webhook accessible from outside your network
+
+## Initial Setup
+
+- Create a new folder called `capacitor` inside the `flux-system` folder.
+- Update the `kustomization.yaml` file in `flux-system` with `- capacitor`
+- Next we will need 3 files inside the capacitor folder:
+
+
+capacitor.yaml
+```yaml
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: capacitor
+  namespace: flux-system
+spec:
+  targetNamespace: flux-system
+  interval: 1h
+  retryInterval: 2m
+  timeout: 5m
+  wait: true
+  prune: true
+  path: "./"
+  sourceRef:
+    kind: OCIRepository
+    name: capacitor
+```
+
+ingress.yaml
+```yaml
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: capacitor
+  namespace: flux-system
+  annotations:
+    cert-manager.io/cluster-issuer: domain-0-le-prod # use what you have configured for your ingress
+    cert-manager.io/private-key-rotation-policy: Always
+spec:
+  ingressClassName: internal
+  rules:
+  - host: capacitor.${DOMAIN_0} # use what you have configured for your ingress
+    http:
+      paths:
+      - pathType: Prefix
+        path: /
+        backend:
+          service:
+            name: capacitor
+            port:
+              number: 9000
+  tls:
+    - hosts:
+      - capacitor.${DOMAIN_0} # use what you have configured for your ingress
+      secretName: capacitor-tls-0 # use what you have configured for your ingress
+```
+
+kustomization.yaml
+``` yaml
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - capacitor.yaml
+  - ingress.yaml
+```
+
+## Add The Repository
+
+Go to your `Reponsitories/oci` directory and create this file.
+
+capacitor-manifests.yaml
+``` yaml
+apiVersion: source.toolkit.fluxcd.io/v1beta2
+kind: OCIRepository
+metadata:
+  name: capacitor
+  namespace: flux-system
+spec:
+  interval: 12h
+  url: oci://ghcr.io/gimlet-io/capacitor-manifests
+  ref:
+    semver: ">=0.1.0"
+```
+
+Update the kustomization.yaml in oci to include `- capacitor-manifests.yaml`
+
+## Finishing Steps
+
+Reoncile your cluster.
+
+  ``` shell
+  flux reconcile source git cluster
+  ```