Add Airgapped Offline Python VSCode DevContainer entry (devcontainers#645)

* Add Airgapped Offline Python VSCode DevContainer entry

* Fix newline at end of file in collection-index.yml

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Co-authored-by: Abdurrahmaan Iqbal <137001048+abdurriq@users.noreply.github.com>

Author: alefbt

_data/collection-index.yml

@@ -1366,3 +1366,8 @@
   contact: https://github.com/iambipinpaul/devcontainer-features/issues
   repository: https://github.com/iambipinpaul/devcontainer-features
   ociReference: ghcr.io/iambipinpaul/devcontainer-features
+- name: Airgapped / Offline Python VSCode DevContainer
+  maintainer: OpenTechIL
+  contact: https://github.com/OpenTechIL/offline-python-vscode-devcontainer/issues
+  repository: https://github.com/OpenTechIL/offline-python-vscode-devcontainer
+  ociReference: ghcr.io/opentechil/offline-python-vscode-devcontainer