feat(Threadfin) - Move Threadfin to Stable Train (#30612)

**Description**
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Please include a summary of the change and which issue is fixed. Please
also include relevant motivation and context. List any dependencies that
are required for this change.
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Request to move chart from incubator to stable train.
Created initial documentation for chart install.

⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

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

**🧪 How Has This Been Tested?**
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Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce. Please also list any relevant details
for your test configuration
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Threadfin chart has been deployed to a test cluster and confirmed to be
operational -
https://github.com/itconstruct/test-cluster/blob/main/clusters/main/kubernetes/apps/threadfin/app/helm-release.yaml
The configuration persisted even with a reboot to the cluster.

**📃 Notes:**
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**✔️ Checklist:**

- [ x] ⚖️ My code follows the style guidelines of this project
- [ x] 👀 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 corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [ x] ⬆️ I increased versions for any altered app according to semantic
versioning
- [ ] I made sure the title starts with `feat(chart-name):`,
`fix(chart-name):` or `chore(chart-name):`

**➕ App addition**

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

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

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charts/stable/threadfin/Chart.yaml

@@ -37,4 +37,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/incubator/threadfin
   - https://hub.docker.com/r/fyb3roptik/threadfin
 type: application
-version: 0.2.0
+version: 1.0.0

charts/stable/threadfin/docs/installation-notes.md

@@ -0,0 +1,19 @@
+---
+title: Installation Notes
+---
+
+## Requirements
+
+To access the ThreadFin administration webpage please add /web to the URL.
+You will need to configure:
+1. A Playlist/s setting the location of the M3U file
+2. Review the settings page and configure as required including number of tuners.
+
+### Plex Requirements
+
+Enable Stream Buffer of FFmpeg in the ThreadFin administration webpage
+
+## Additional info
+
+Review the information here for Plex, Jellyfin or Emby minimum requirements
+https://github.com/Threadfin/Threadfin?tab=readme-ov-file