doc: fix how html, css is added to MicroCeph (v2-edge)

[elijahgreenstein]

When on the MicroCeph section of the v2-edge docs, the top navigation menu currently only shows the MicroCeph navigation links rather than the integrated docs header.

To fix this, this PR updates the docs Makefile to overwrite the MicroCeph header.html file with the integrated header file in the MicroCloud docs (.sphinx/_integration/microceph.html). Based on this change, this PR also removes an unnecessary mkdir rule from the Makefile and removes unnecessary settings from the add_config.py settings for MicroCeph.

Checklist

• I have read the contributing guidelines and attest that all commits in this PR are signed off, cryptographically signed, and follow this project's commit structure.
• I have checked and added or updated relevant documentation.

[roosterfish]

Thanks, why do we need this change only in v2-edge but not in main?

[elijahgreenstein]

The header and footer templates in the latest version of Microceph are in the MicroCeph repo under docs/_templates/. In the version of MicroCeph that we pin to for v2-edge, they are in a different location: docs/.sphinx/_templates/. As a result, we only need to change the destination for the integration header for v2-edge, but not for main.

You can see that, at present, the header is working correctly for latest (main) (https://documentation.ubuntu.com/microcloud/latest/microceph/) but not for v2-edge (https://documentation.ubuntu.com/microcloud/default/microceph/).

[roosterfish]

The header and footer templates in the latest version of Microceph are in the MicroCeph repo under docs/_templates/. In the version of MicroCeph that we pin to for v2-edge, they are in a different location: docs/.sphinx/_templates/. As a result, we only need to change the destination for the integration header for v2-edge, but not for main.

You can see that, at present, the header is working correctly for latest (main) (https://documentation.ubuntu.com/microcloud/latest/microceph/) but not for v2-edge (https://documentation.ubuntu.com/microcloud/default/microceph/).

Thanks for clarifying this!