Information on UEFI boot entries

[Sebastian-Roth]

We should add infos on efibootmgr (UEFI boot entries) to the docs I reckon:

https://forums.fogproject.org/topic/16703/dual-boot-2-disks-unable-to-boot-grub
...

[darksidemilk]

I will try, I gotta do a bit more research to understand what's happening in this forum post example as well as other potential uses. It seems like a very helpful tool that I didn't know existed.

[darksidemilk]

Made the page in reference but still need to add more information on post-install scripts.
Was gonna just reference the forum posts on it but really should have that type of functionality in the docs so would be better to also create a page of post-install scripts.