Reorganize getting started section
Reorganize getting started section

* Split links into user and devs sections
* Move symbiflow-examples to the top
* Drop Symbilow on Arty link (this is now part of examples)

Signed-off-by: Karol Gugala <38af71640571ee4b5093d4f69ffca1ac454f2948@antmicro.com>

SymbiFlow/symbiflow-website,SymbiFlow/symbiflow-website,SymbiFlow/symbiflow-website