Update ViragePlug KS-604S

[breti]

Brief description of the changes

• Remove broken link
• Add board

Type of changes

• New device (a single device only — one device per pull request)
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

The rules below are enforced in CI by npm run validate-devices and npm run validate-yaml. The full reference is at Configuration YAML files.

• Adding a new device adds a single device only — one device per pull request.
• Each example yaml lives in its own .yaml file alongside index.md and is pulled into the page with a fenced block of the form ```yaml file=<name>.yaml — no inline yaml on added or modified pages.
• The first file= fence on the page references config.yaml.
• config.yaml is hardware-only: no top-level api:, ota:, mqtt:, web_server:, web_server_idf:, improv_serial:, captive_portal:, bluetooth_proxy:, or dashboard_import:, and no platform: homeassistant, platform: mqtt, or platform: template anywhere in the tree.
• If config.yaml has a wifi: block, it contains only radio tunables (country, power_save_mode, output_power, …) — no ssid, password, networks, manual_ip, eap, or use_address. An empty ap: block is allowed.
• No passwords (literal or !secret) on password:, *_password:, or psk: keys, and no !secret references anywhere in any example yaml.
• For pages with made-for-esphome: true in frontmatter: at least one ```yaml url=… fence points at a .yaml file in the manufacturer's GitHub repo (github.com/<owner>/<repo>/(blob|raw)/<ref>/<path>.yaml or the raw.githubusercontent.com equivalent) so the rendered page shows the upstream config live.

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