chore(docs): Update dev docs link in readme (#7835)

**Description**
Updates the development documentation link in the readme as it appears
that the old one is out of date.

⚒️ Fixes  N/A

**⚙️ 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?**
N/A

**📃 Notes:**
N/A

**✔️ 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
- [ ] 📄 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](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

_Please don't blindly check all the boxes. Read them and only check
those that apply.
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.github/README.md

@@ -79,7 +79,7 @@ This ensures freedom and flexibility for everyone involved and makes sure you, t
 
 Creating charts takes some getting used to, as it's based on Helm charts. We highly suggest prior know-how on creation/modifying Helm Charts, before taking on the challenge of creating SCALE Apps.
 
-For more information on creating SCALE Apps and Helm charts, please check out our [development manual](https://truecharts.org/manual/development/License-headers)
+For more information on creating SCALE Apps and Helm charts, please check out our [development manual](https://truecharts.org/manual/development/chart-structure/)
 
 ### Automation and you