game entry file names changed to canonical version

games/freeciv_webgl.md

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+# Freeciv WebGL
+
+_Freeciv-web is a version of Freeciv playable online in any modern web browser._
+
+- Home: https://web.archive.org/web/20180102150750/https://play.freeciv.org/
+- Media: https://en.wikipedia.org/wiki/Freeciv#Freeciv_WebGL_3D_and_Freeciv-web
+- State: mature
+- Keywords: strategy, online, turn-based
+- Code repository: https://github.com/freeciv/freeciv-web.git
+- Code language: JavaScript, Java
+- Code license: AGPL-3.0
+
+Modifies [Freeciv](freeciv.md) slightly and uses it as server.
+
+## Building
+
+Maven, Docker
+