docs: add Apiary service warning and update API links

[zajca]

Jira issue(s): N/A

Changes:

• Added warning alert about potential Apiary documentation service outages (Oracle EOL Oct 2026)
• Added alternative source link to Storage API docs (GitHub apiary.apib)
• Updated Management API link to https://api.keboola.com/#get-/manage/tokens/verify

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Context: Apiary (Oracle) has been experiencing intermittent 502 errors. This update provides users with alternative documentation sources while the service is unstable.

Updates since last revision:

• Fixed alert overflow issue with side menu by using proper HTML div format instead of markdown syntax

Human review checklist:

• Verify the new Management API URL is correct and accessible
• Verify the warning message wording is appropriate for external users
• Verify alert displays correctly without overflow

Link to Devin run: https://app.devin.ai/sessions/21b5660ccd79453ba0b8758c48f0465d
Requested by: @zajca
Slack link: https://keboolaglobal.slack.com/archives/C0553EM2RGX/p1770157854608279

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[zajca]

Devin alert is doing overflow with side menu fix that

[zajca]

Cool

[odinuv]

no tak jako dočasně jo, ale jinak by to chtělo nějak dát doháje