Change tccr.io into oci.trueforge.org (#38868)

**Description**
We're moving from tccr.io to oci.trueforge.org

TCCR meant "TrueCharts Container Repository" however, it mostly stores
chart artefacts.
At the same time, we want to more clearly allow us to store
containers/artifacts not related to truecharts.

Its also worth noting that an additional .io domain carries additional
costs.

**⚙️ 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
- [ ] 📜 Documentation Changes

**🧪 How Has This Been Tested?**
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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
- [ ] 📄 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
- [ ] 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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those that apply.
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website/src/content/docs/guides/helm.md

@@ -13,7 +13,7 @@ We only support our own helm-charts. If you run anything outside the scope of ou
 If you want to install a chart using helm, lookup the name of the chart in our [Chart list](/charts/description-list). Then, run this command to install it directly from our OCI repository:
 
 ```shell title="Install Chart"
-   helm install mychart oci://tccr.io/truecharts/CHARTNAME
+   helm install mychart oci://oci.trueforge.org/truecharts/CHARTNAME
    ```
 
 _Where `CHARTNAME` is the name of the chart you want to add and `mychart` is the name you want it to have on your system._
@@ -21,7 +21,7 @@ _Where `CHARTNAME` is the name of the chart you want to add and `mychart` is the
 We highly suggest your write your customisations and user specific options in your own `values.yaml` file. After which, you can install the chart with your user-specific settings applied using:
 
 ```shell title="Install Chart With Settings"
-   helm install mychart oci://tccr.io/truecharts/CHARTNAME -f values.yaml
+   helm install mychart oci://oci.trueforge.org/truecharts/CHARTNAME -f values.yaml
    ```
 
 _`values.yaml` can be replaced with a path of your choice._
@@ -29,7 +29,7 @@ _`values.yaml` can be replaced with a path of your choice._
 We also advise users to specify separate namespaces for deployed charts using:
 
 ```shell title="Chart Namespaces"
-   helm install mychart oci://tccr.io/truecharts/CHARTNAME -f values.yaml -n NAMESPACE
+   helm install mychart oci://oci.trueforge.org/truecharts/CHARTNAME -f values.yaml -n NAMESPACE
    ```
 
 _Where `NAMESPACE` is the namespace you want to deploy to._
@@ -42,7 +42,7 @@ To upgrade either the chart version and/or the user-defined settings for an alre
 While this does not actually update the chart version, it does update the user settings supplied via the `values.yaml` file specified above.
 
 ```shell title="Chart Upgrades"
-   helm upgrade oci://tccr.io/truecharts/CHARTNAME -f values.yaml -n NAMESPACE
+   helm upgrade oci://oci.trueforge.org/truecharts/CHARTNAME -f values.yaml -n NAMESPACE
    ```
 
 For more information, please see the [Helm upgrade docs](https://helm.sh/docs/helm/helm_upgrade/)