[backport]: demo fixes to v1.2

[jsturtevant]

Backports fixes to v1.2:

• https://github.com/openservicemesh/osm-docs/commit/2a23d97fa3cc64972bc8794c009a785bd8a0f54b
• https://github.com/openservicemesh/osm-docs/commit/629454430a97a87df2caab68e3b9a8c61033029c
• https://github.com/openservicemesh/osm-docs/commit/0ac225b21e3c09248005a2c693ca48eaeccd6177

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