fix: repair broken click targets on docs.dapr.io

[harkiratsm]

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Description

Fixes broken click targets on docs.dapr.io (v1.18):

• Metrics overview Dapr API error codes → /developing-applications/error-codes/ (was /reference/api/error_codes/ 404)
• Footer YouTube @darpdev → @daprdev
• Secrets (JS) and state-management (Go) sample links hhttps:// → https:// (Hugo was emitting #ZgotmplZ)
• Resiliency quickstart this link: drop trailing //

Issue reference

fixes#5281 5281