Add bot information page and update UA to point to it

[Valve]

The agent-tools.cloud crawler has this user-agent: agent-tools.cloud-crawler/0.1 (+https://agent-tools.cloud)
but ideally the URL should lead to the bot page, e.g.

agent-tools.cloud-crawler/0.1 (+https://agent-tools.cloud/bot)

And the bot page should contain all the information to correctly detect it (e.g. user agent, IP range or the rDNS data).

Example for MCPBeat.com: https://mcpbeat.com/bot/