fix(Config): colorization without pager (#687)

Fix an issue whereby colorization would output ANSI codes if a pager was
not configured.

The solution here is to stop guessing about the state of the user's
system at runtime, as well as the user's intention. The installer now
chooses an appropriate installer when generating configs, and no longer
bothers searching for pagers at runtime.

cmd/cheat/str_config.go

@@ -24,7 +24,9 @@ colorize: false
 formatter: terminal
 
 # Through which pager should output be piped?
-# pager: less -FRX # <- recommended where available
+# 'less -FRX' is recommended on Unix systems
+# 'more' is recommended on Windows
+pager: PAGER_PATH
 
 # The paths at which cheatsheets are available. Tags associated with a cheatpath
 # are automatically attached to all cheatsheets residing on that path.