Update cheatsheets

tldr/opencode-web

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# opencode web
+
+> Start an OpenCode server with a web interface.
+> More information: <https://opencode.ai/docs/cli#web>.
+
+- Start the web interface on the default port:
+
+`opencode web`
+
+- Start on a specific port:
+
+`opencode web --port {{8080}}`
+
+- Start on a specific hostname:
+
+`opencode web --hostname {{0.0.0.0}}`
+
+- Enable mDNS service discovery:
+
+`opencode web --mdns`
+
+- Display help:
+
+`opencode web {{[-h|--help]}}`