docs(README): move support to a community support file

[zr-msft]

Signed-off-by: Zach Rhoads [email protected]

Description: relocated support content to SUPPORT file per Github docs.

Testing done: Change made to markdown file so verified render looks correct

Affected area:

Functional Area
New Functionality	[ ]
CI System	[ ]
CLI Tool	[ ]
Certificate Management	[ ]
Control Plane	[ ]
Demo	[ ]
Documentation	[ x ]
Egress	[ ]
Ingress	[ ]
Install	[ ]
Networking	[ ]
Observability	[ ]
Performance	[ ]
SMI Policy	[ ]
Security	[ ]
Sidecar Injection	[ ]
Tests	[ ]
Upgrade	[ ]
Other	[ ]

Please answer the following questions with yes/no.

1. Does this change contain code from or inspired by another project? NO

   • Did you notify the maintainers and provide attribution?

2. Is this a breaking change? NO

3. Has documentation corresponding to this change been updated in the osm-docs repo (if applicable)? N/A

[codecov-commenter]

Codecov Report

Merging #4785 (7572932) into main (436e24f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4785   +/-   ##
=======================================
  Coverage   68.92%   68.92%           
=======================================
  Files         224      224           
  Lines       16388    16388           
=======================================
  Hits        11296    11296           
  Misses       5040     5040           
  Partials       52       52           

Flag	Coverage Δ
unittests	68.92% <ø> (ø)

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