Expand glossary and use {{< gloss >}} to use as metadata for See Also and SEO

[geeknoid]

We should expand the glossary, and make use of the site's {{< gloss >}} feature that allows pop ups for glossary terms. Some terms to include:

• [x] Mesh Configuration Protocol (MCP)
• [x] Secret Discovery Protocol (SDS)
• [ ] Ingress Gateway
• [ ] Egress Gateway
• [x] Sidecar
• [x] SPIFEE
• [ ] Container Network Interface (CNI)
• [x] Virtual Service
• [ ] Destination Rule
• [ ] Custom Resource Definition
• [ ] Circuit breaker
• [ ] Load shedding
• [ ] Strong Identity

I'll add more as I think of 'em.

[geeknoid]

See #3434

[rcaballeromx]

See #3686 Also related. I've assigned this bug to myself to tackle these terminology taxonomy issues for 1.2.

[rcaballeromx]

I've created an epic out of the existing issue. @geeknoid @frankbu @sdake @mandarjog @oaktowner Please create an issue and add it to the epic for each term you want implemented in the Glossary and with the first instance in every page marked with {{< gloss >}} consistently across the English (en) version of the docs. Please let everyone know. I'll post something on discuss.istio.io tomorrow.

[geeknoid]

Why an epic for this? Creating issues for individual words seems a heavy process, when the checkbox list within this single issue seems sufficient to track what needs to be documented.

[rcaballeromx]

Issue created for Mesh Configuration Protocol to serve as an example for the community. https://github.com/istio/istio.io/issues/4218

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