Added nfdump superficial configuration, comments about using nfcapd or sfcapd, CLI as a systemd service and logs sections

[FontouraAbreu]

Some markdown best practices where used instead of html tags or **text** instead of ## text for example fixed api_endpoints hyperlinks at TOC section

[davidshirk80]

On the nfdump section. When installed on Ubuntu 22.04 using the install docs, the listed config file simply does not exist (line 80). There are several files listed in the /root/nfdump-1.7.4/ folder, but nothing else. Where is the referenced nfdump config file exist on the ubuntu setup. The running, working nfdump install when installed as per directions is usr/local/bin/nfdump