Add guides for upgrade from 1.4 and Helm (#7689)
Add guides for upgrade from 1.4 and Helm (#7689)

* Add guides for upgrade from 1.4 and Helm

* Update content/en/docs/setup/upgrade/index.md

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>

* Update content/en/docs/setup/upgrade/index.md

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>

* Update content/en/docs/setup/upgrade/index.md

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>

* Update content/en/docs/setup/upgrade/index.md

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>

* Update content/en/docs/setup/upgrade/index.md

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>

* Update content/en/docs/setup/upgrade/index.md

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>

* Update content/en/docs/setup/upgrade/index.md

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>

Co-authored-by: Frank Budinsky <eff2b2321921dd21161b5817c477702c05bb637b@ca.ibm.com>
istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io