bug: Stable url for keyboard download no longer works

[LornaSIL]

Our sldr files use this form of url to reference a keyboard, but it just goes to the home page for the keyboard:
https://keyman.com/go/keyboard/sil_euro_latin/download/kmp

This one works: https://keyman.com/go/package/download/sil_euro_latin

However, @mcdurdin says the first one is recommended and the second one is not a publicly stable one.

This is possibly a bug coming out of our move to Docker with Apache recently.

[darcywong00]

Preliminary investigation:

Original IIS rule

keyman.com/go/web.config

Lines 21 to 25 in ab3d0a4

	<!-- TODO: these three rules need refresh -->
	<rule name="download-kmp" stopProcessing="true">
	<match url="^keyboard/([^/?]+)/download/kmp$" />
	<action type="Redirect" url="/keyboards/download?id={R:1}&amp;platform=windows&amp;mode=standalone" />
	</rule>

Current .htaccess rule

keyman.com/go/.htaccess

Lines 10 to 11 in b695ba0

	# download-kmp
	RedirectMatch "/go/keyboard/([^/?]+)/download/kmp$" "/keyboards/download?id=$1&platform=windows&mode=standalone"

Seems both go to /keyboards/download?id=$1&platform=windows&mode=standalone

Will check if that's supposed to load a page or redirect to a kmp file
Following where /keyboards/download goes...