ahh ok.
the homepage is responsive. its not a separate site. Essentially css and some javascript detect the width of your browser and flex the display code a bit to fit. At narrow widths, the top nav bar collapses into the three horizontal lines (often referred to as 'hamburger')
The links should all work - but I tested a few minutes ago and they indeed, did not (for me)
I will fix this.
THe forums themselves are fully functional on mobile, but its not a responsive nor an adaptive mobile design. It may be possible to make it more mobile friendly - I will look into this.