wiki page: Installing/Getting MegaGlest

[andy_5995]

I've updated the main page, removing most instances of *Glest. It had a prominent link pointing to a very outdated page about getting and installing *Glest.

There is a link for *MegaGlest at the top, but when I go to that page there is not detailed information about getting and installing *MegaGlest like there is on the Getting *Glest page.

So.. I changed that link, and renamed the page.

https://docs.megaglest.org/Getting_MegaGlest

The page above is in urgent and serious need of updating.

A link to https://docs.megaglest.org/Compiling or https://docs.megaglest.org/MG/Development should be included

[andy_5995]

I managed to do some quick and messy edits to take care of the biggest problems, but this page still needs to be reviewed and edited.