requiremends docs improved with missing information fixed

[mckaygerhard]

• it addressed and close Prerequisites for System Drive too low #131 the requirements talk about installation, not about upgrades (not updates that can be managed), so the wording is on the right way because later points about it, so i managed the issue about upgrades... on Prerequisites for System Drive too low #131 are not so valid
• improves the very vage requirements documentation
  • OMV is the most flexible NAS system pointed that and try to clarify all the need over hardware and sofware
  • separate software requirements and hardware requirements, the previous document was so vage, maybe this is so extended, i am open to suggestions and let open to maintainers editors this PR
  • pointed that the OS Debian is the main software requisite
  • pointed that NIC is a missing hardware requirement and why! is a NAS system and also write about such terminology.
  • software requirementes are handled by OS and depends but pointed some packages that are important for, so confusion about will not happened
  • not all the software requirements are handle by OS, by example we need a valit network for comunication
• Page must be titled as "requirementes" cos hardware are prerequisited but those depends on software main one: the Debian OS, if such hardware is not supported so OMV could not be installed or worked in good way.. so prerequisites as list are very confused about it
• set that minimal requirements are fit and able to manage:
  • a root fs partiton of 1.5G was enough using netinstall iso, and deactivating recommends, after that setup no automatic updates and create cron task to clean apt package cache. this dont allow upgrades but allows updates.
  • a swap of 100M was enough i setup linux to do not use swap in any case.. but novice user wil not have skilss so ..
  • of course those are for skilled users.. so write sections of recommendations for novice users
• setup a NAS system is easy with OMV but a minimal of knowledge is required for non experienced users, so write such need in each section. Warning i put that 1 disk is enought as storage drives, that is basically officially true adn supported, if you as skilled adminstrator just install OMV over fresh debian setup! this could be by leaving a free partition already formated!

[mckaygerhard]

holy crap i titled very bad the PR, also commit! umm i dont but you can squas all the commits and edit the final title of the resulting commit.. so its not a problem

[mckaygerhard]

close in favor of #143 sorry for noise..