Nah pointless and not worth the effort, it should stay as it is. its portable anyway so stick it on a usb stick and play it from that if you use multiple computers and are to lazy to download it again.
Just because Minecraft has a browser version doesn't mean Minetest should, It would be better if developers dedicated there time for fixing bugs, adding features and improving the game rather than wasting time on building a browser based version for no reason what-so-ever other than "Minecraft has it, So we should too" or laziness.