"Run-node" `System Requirements` page needs refactoring

[blacks1ne]

System Requirements page is important, but currently contains information that could be rather confusing:

1. The golden 1:2:4 ratio is mentioned in the root of the Minimum Hardware Requirements section and partially discusses CPU, memory and storage.
2. The ration application examples mention CPU cores and memory only missing the storage requirements
3. It is not clear what to do when some hardware aspect becomes a bottleneck, e.g. having not enough RAM for CPU cores
4. CPU is also discussed in Hyperthreading sub-section of Minimum Hardware Requirements
5. CPU clock is discussed in Clock Speeds sub-section of Hardware Selection section
6. Lack of GPU support is mentioned several times: once in the root of Minimum Hardware Requirements section along with ASIC and FPGA and then in a dedicated Graphics Cards (GPUs) sub-section
7. Guidance never introduces the concept of a worker, so it is not clear what the ratio applies to and what should be limited in case of bottlenecks
8. Logical cores concept could be enhanced with examples or replaced with threads to let node operators apply it to the available CPU specs (e.g. 8C/16T core-thread spec is common)
   We could consider speaking separately about key hardware such as CPU, memory and disk, while dedicating a separate section to cover workers with golden ratios.