moved the entries up one folder, added the folder to the keywords

games/pax_britannica.md

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+# Pax Britannica
+
+_One-button real-time strategy game._
+
+- Home: http://paxbritannica.henk.ca/
+- State: mature
+- Keywords: strategy, MP, RTS
+- Code repository: https://github.com/henkboom/pax-britannica.git
+- Code language: Lua, C
+- Code license: MIT
+
+## Building
+