Improve app install and config guide

[JammingBen]

I think this makes it a bit more clear how to install and especially configure apps, since we often get questions about it.

[Copilot]

Pull request overview

Clarifies the OpenCloud Web Apps admin documentation around where to install web apps and how to provide app-specific configuration (including a recommended global apps.yaml approach).

Changes:

• Rewords the “Extract and copy” section to describe the app installation directory and opencloud-compose placement.
• Adds a recommended configuration method using apps.yaml, plus an alternative config.json example.
• Applies the same documentation updates across the unversioned docs and two versioned doc sets (4.0 and 7.2).

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
docs/admin/configuration/web-applications.md	Updates installation path guidance and adds apps.yaml-based configuration example.
versioned_docs/version-7.2/admin/configuration/web-applications.md	Mirrors the same install/config documentation improvements for v7.2 docs.
versioned_docs/version-4.0/admin/configuration/web-applications.md	Mirrors the same install/config documentation improvements for v4.0 docs.

Suppressed comments (3)

docs/admin/configuration/web-applications.md:51

• apps.yaml is documented elsewhere as living under the base data path ($OC_BASE_DATA_PATH/config/apps.yaml), not under $OC_CONFIG_DIR/apps.yaml. Pointing to $OC_CONFIG_DIR here is likely incorrect and will send admins to the wrong directory.

The recommended way to configure such apps is via the `apps.yaml` configuration file located under `$OC_CONFIG_DIR/apps.yaml`. That way, you ensure a consistent config that doesn't get overwritten when updating apps.

versioned_docs/version-7.2/admin/configuration/web-applications.md:51

• apps.yaml is documented elsewhere as living under the base data path ($OC_BASE_DATA_PATH/config/apps.yaml), not under $OC_CONFIG_DIR/apps.yaml. Pointing to $OC_CONFIG_DIR here is likely incorrect and will send admins to the wrong directory.

The recommended way to configure such apps is via the `apps.yaml` configuration file located under `$OC_CONFIG_DIR/apps.yaml`. That way, you ensure a consistent config that doesn't get overwritten when updating apps.

versioned_docs/version-4.0/admin/configuration/web-applications.md:51

• apps.yaml is documented elsewhere as living under the base data path ($OC_BASE_DATA_PATH/config/apps.yaml), not under $OC_CONFIG_DIR/apps.yaml. Pointing to $OC_CONFIG_DIR here is likely incorrect and will send admins to the wrong directory.

The recommended way to configure such apps is via the `apps.yaml` configuration file located under `$OC_CONFIG_DIR/apps.yaml`. That way, you ensure a consistent config that doesn't get overwritten when updating apps.

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[Heiko-Pohl]

LGTM 🚀