Update cheatsheets

bird

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# bird
+
+> BIRD Internet Routing Daemon.
+> Routing daemon with support for BGP, OSPF, Babel and others.
+> More information: <https://bird.network.cz/>.
+
+- Start Bird with a specific configuration file:
+
+`bird -c {{path/to/bird.conf}}`
+
+- Start Bird as a specific user and group:
+
+`bird -u {{username}} -g {{group}}`