Just simply converting .aspx files into .html is easy (though may be difficult to implement, not sure) but
it really depends on your website builder service website or software.
For the Xtreme FusionFall website, I made that on Yola.com
and it doesn't allow html, it allows .php and was made with a simple to use
graphical interface for building pages. (Little coding if at all.)
If your website builder website or software does allow you, it should have an option in the service or software you're using.
if not, maybe you can just rename the file (you need to have extension viewing enabled) to end with a .html extension.
Or maybe you could use a html converter.
I don't know what you mean by the 'huge scary spider'
and this forum isn't really for helping commercial companies with
web tasks. We're only a FusionFall fansite forum.
(Limited website and business knowledge.)
(FusionFall is an MMO game from Cartoon Network.)
Most of us are young players of that game, don't know why you thought
to come to us for this advice.
And this isn't my field since I don't use software, I use
Yola which is pretty simple to use. (I hate coding. Not my thing.)
If you don't know what FusionFall is, here is the link to the website:
We're just a fansite forum (and website) of that game.
(Just in case you thought we were just a general forum, which we aren't. We're an mmo game fansite.)
Sorry if that's not helpful.
Check your website builder's help section.