fix(mymediaforalexa): moved to stable and mod docs

[xstar97]

Description updated the docs and moved the chart to stable.

⚒️ Fixes #

⚙️ Type of change

• [ ] ⚙️ Feature/App addition
• [X] 🪛 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? was able to get it to play my music on a range of alexa devices

📃 Notes:

✔️ 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
• [ ] ⬆️ I increased versions for any altered app according to semantic versioning

➕ App addition

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

• [ ] 🪞 I have opened a PR on truecharts/containers adding the container to TrueCharts mirror repo.
• [ ] 🖼️ I have added an icon in the Chart's root directory called icon.png

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Please don't blindly check all the boxes. Read them and only check those that apply. Those checkboxes are there for the reviewer to see what is this all about and the status of this PR with a quick glance.

[xstar97]

Do i need to add the old files back in incubator?

[PrivatePuffin]

Needs a rebase

[truecharts-admin]

This PR is locked to prevent necro-posting on closed PRs. Please create a issue or contact staff on discord if you want to further discuss this