Update Docforge version

[BoHristova]

How to categorize this PR?

/kind task

What this PR does / why we need it:

• Upgrades Docforge from v0.55.0 to v0.57.0.
• Adds a custom _splitIntoSections function in .vitepress/config.mts to fix MiniSearch duplicate ID errors introduced by the upgrade.

Which issue(s) this PR fixes:
Fixes #835 #857

Special notes for your reviewer:

[gardener-prow]

@BoHristova: The label(s) kind/todo cannot be applied, because the repository doesn't have them.

Details

In response to this:

How to categorize this PR?

/kind TODO

What this PR does / why we need it:

• Upgrades Docforge from v0.55.0 to v0.57.0.
• Adds a custom _splitIntoSections function in .vitepress/config.mts to fix MiniSearch duplicate ID errors introduced by the upgrade.

Which issue(s) this PR fixes:
Fixes #835 #857

Special notes for your reviewer:

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[gardener-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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