doc: add a doc on how to set up the certificate.

[nowinkeyy]

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Summary

Status	Count
🔍 Total	1258
✅ Successful	376
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	879
❓ Unknown	0
🚫 Errors	2

Errors per input

Errors in docs/4.0/i18n/zh-Hans/examples/baas/install-fireboom.md

• [ERR] https://fireboom.cloud/ | Failed: Network error: dns error: no record found for Query { name: Name("fireboom.cloud.uupnl4tosoeephoww5grboovnh.bx.internal.cloudapp.net."), query_type: AAAA, query_class: IN }

Errors in docs/4.0/docs/examples/baas/install-fireboom.md

• [ERR] https://fireboom.cloud/ | Failed: Network error: dns error: no record found for Query { name: Name("fireboom.cloud.uupnl4tosoeephoww5grboovnh.bx.internal.cloudapp.net."), query_type: AAAA, query_class: IN }

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