Migration / deletions and redirects... (#5962)

* Remove outdated documentation on custom hosting integrations and secure communication; update links to new integration resources; modify interaction service documentation for clarity; and streamline the table of contents by removing obsolete entries.

* Update documentation links and remove deprecated files

- Changed relative links to absolute links for better accessibility in the deployment overview and app host overview documentation.
- Deleted the annotations overview file as it is no longer needed.
- Updated various sections to reflect the new URL structure for Aspire documentation.
- Removed the tutorial on adding Aspire to an existing .NET app, as it has been replaced with a new version.
- Ensured all references to Dockerfile integration and eventing are updated to point to the new documentation URLs.

* Update documentation links to point to new Aspire.dev URLs; remove obsolete files and references.

* Update links to Aspire documentation and resources

- Changed internal links to external links for Aspire AppHost and CLI documentation for better accessibility.
- Updated references in various documents to point to the new Aspire documentation structure.
- Ensured consistency in linking to the Aspire dashboard and orchestration overview across multiple files.
- Improved clarity in the custom resource commands and integrations overview sections by linking to the appropriate resources.

* Update redirection URLs to point to new Aspire.dev resources

* Refactor documentation links to use absolute URLs for deployment resources

- Removed the deployment overview document and updated references across multiple files to point to the new absolute URL.
- Deleted the custom deployments guide as it is no longer needed.
- Updated various sections to ensure consistency in linking to deployment manifest format and related resources.
- Improved clarity in the FAQs regarding deployment manifest usage and Aspire's integration with Kubernetes.
- Enhanced the "What's New" sections to reflect changes in deployment security and unified Azure provisioning.

* Delete outdated documentation files and update links to point to the new Aspire documentation site. Removed the "Aspire inner loop networking overview" and "Persist Aspire project data using volumes" articles, and ensured all references in other documents are updated to the new URLs. Additionally, made various adjustments to the "What's New" documentation to reflect the latest changes and improvements in Aspire, including enhancements to external parameters and custom HTTP commands.

* Update redirect URLs for Azure Storage and Redis caching documentation

* Update links in documentation to use absolute URLs for Aspire resources

* Update documentation links to use absolute URLs for AppHost and related resources

* Delete Python app orchestration documentation and related media files; update links to Aspire integrations overview; remove obsolete snippets and project files for Python sample; enhance integration observability and telemetry references.

* Update redirect URLs for PostgreSQL and Entity Framework documentation; correct links for Azure Storage and messaging integrations.

* Update redirect URLs for PostgreSQL and Entity Framework documentation; remove obsolete FAQ and update links in various sections

* Update documentation links to use absolute URLs for Azure integrations and enhance clarity in various sections

* Update Azure Container Apps redirect URLs to point to the correct documentation path

Author: IEvangelist