The original FMS12 installer has the uninstall option.
The other thing though is that you upgraded to 10.10 only because you could not buy 10.9 Server. You don't need OSX server to run FMS and there have been many reports about OSX Server not being compatible with FMS13. Maybe you missed those.
So before you waste too much time, roll back to your original snapshot and forgeto about installing OSX Server.
This isn't a production setup - just for occasional development. I use the server for other things so its primary use is OS X server. I did use the original FMSA 12 installer to try and delete it - I always keep an archive of old versions for this purpose - I suspect the installer has a compatibility problem with Yosemite. I don't have much invested on the server side setup up so if I can't find another solution, I guess I'll just wipe the server volume and reinstall from scratch. Was hoping to avoid that. I had been running FMS 13 on Mountain Lion Server without problem but admittedly, wasn't pushing it very hard or doing anything very sophisticated. I do recall posts mentioning conflicts with WebDirect in particular and OS X server but I haven't tried WebDirect for anything yet.
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Default installation use /Library/FileMaker Server, not root level.