docs: DOC-912: Add Maintenance Mode Documentation

[achuribooks]

Describe the Change

This PR fills a documentation hole pertaining to maintenance mode, which was implemented in 4.0 but never documented outside of release notes. Existing release notes are also misleading, as maintenance mode also works on non-VMO clusters.

PR 5193 fixes the release note. Merge it ONLY AFTER this PR (5100) is complete.

Changed Pages

💻

• Maintenance Mode - Created new page.
• Manage Clusters - Added to bottom of page as a bullet.
• Create Cluster Backup - Limitation added.
• Compliance Scan - Updated note to indicate that scans cannot be performed in maintenance mode.
• Architecture - Added x-ref to new maintenance mode page.
• Migrate a VM to a Different Node - Added x-ref to new maintenance mode page.

Jira Tickets

🎫 DOC-912

Backports

Can this PR be backported?

• Yes. Remember to add the relevant backport labels to your PR.
• No. Please leave a short comment below about why this PR cannot be backported.

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[vault-token-factory-spectrocloud]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 3.7%, saving 3.76 KB.

Filename	Before	After	Improvement	Visual comparison
static/assets/docs/images/clusters_cluster-management_maintenance_mode.webp	102.49 KB	98.73 KB	-3.7%	View diff

785 images did not require optimisation.

[vault-token-factory-spectrocloud]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 1.3%, saving 1.24 KB.

Filename	Before	After	Improvement	Visual comparison
static/assets/docs/images/clusters_cluster-management_maintenance_mode.webp	98.73 KB	97.48 KB	-1.3%	View diff

785 images did not require optimisation.

[caroldelwing]

Approved with tiny suggestions. Well done 👏

[vault-token-factory-spectrocloud]

💔 Some backports could not be created

Status	Branch	Result
❌	version-4-0	Backport failed because of merge conflicts You might need to backport the following PRs to version-4-0: - docs: unhyphenate open source (#4284) - docs: DOC-1118 Image Conversion to webp (#2439) - docs: updated URLs to use file path context
❌	version-4-1	Backport failed because of merge conflicts You might need to backport the following PRs to version-4-1: - docs: unhyphenate open source (#4284) - docs: DOC-1118 Image Conversion to webp (#2439)
❌	version-4-2	Backport failed because of merge conflicts You might need to backport the following PRs to version-4-2: - docs: unhyphenate open source (#4284) - docs: DOC-1118 Image Conversion to webp (#2439)
❌	version-4-3	Backport failed because of merge conflicts You might need to backport the following PRs to version-4-3: - docs: unhyphenate open source (#4284)
❌	version-4-4	Backport failed because of merge conflicts You might need to backport the following PRs to version-4-4: - docs: unhyphenate open source (#4284)
✅	version-4-5

Note: Successful backport PRs will be merged automatically after passing CI.

Manual backport

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backport --pr 5100

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