* updated SD-Card recommendation:
- remove outdated reviews (they were updated but not worth to keep it in docs anymore)
- replaced recommended cards with A1/A2 examples only
- added A1/A2 table according to https://www.sdcard.org/developers/overview/application/index.html)
* Updated 'How to set fixed IP?'
- editing of /etc/network/interfaces doesn't represent armbians recommendations anymore
* fix tab error and a small typo
* change supported compilation environment:
- to avoid inconsistency between https://github.com/armbian/build/blob/master/README.md and docs)
