* Reorganize node requirements
* Cherry pick 'Fix links' commit
* Cherry pick 'Link to RKE port requirements for each node in Rancher docs'
* Fix merge conflict errors
* Delete page that was moved elsewhere
* Delete section that was included elsewhere
* Re-add port requirements for custom nodes
* Rearrange pages
* Change wording of note in Rancher installation requirements
* Fix links
* Edit links
* Edit links
* Replace user cluster requirements page
* Fix typo
* Fix link to imported cluster requirements
* Revise node requirements
* Add mini TOC for port requirements
* Remove alias for port requirements page
The current TOC structure is missing a General category which makes it read like CentOS/RHEL is the recommended distro..
Adding a General Linux Recommendations better highlights that the RHEL stuff is additional information for those distros.
the bash scripts compiles into a single line which results into something like this:
```
for module in br_netfilter ip6_udp_tunnel ip_set ip_set_hash_ip ip_set_hash_net iptable_filter iptable_nat iptable_mangle iptable_raw nf_conntrack_netlink nf_conntrack nf_conntrack_ipv4 nf_defrag_ipv4 nf_
nat nf_nat_ipv4 nf_nat_masquerade_ipv4 nfnetlink udp_tunnel veth vxlan x_tables xt_addrtype xt_conntrack xt_comment xt_mark xt_multiport xt_nat xt_recent xt_set xt_statistic xt_tcpudp; do if ! lsmod | grep -q $module; then echo "module $m
odule is not present" fi done;
```
to avoid syntax error, extra semicolons fixes the issue
Richard Brown
Catherine Luse
Cameron Seader
Bastian Hofmann
Sebastiaan van Steenis
Court
Catherine Luse
Robert Parker
Denise
William Jimenez
Andrew Greenwood
Oleg Tarassov
ahmadali shafiee
David Noland
Vincent Fiduccia