Make all docs have TOC on the right hand side.

[tejal29]

Relates to #3023, #3024.

Description

• make all docs have a toc on the right.
• Add links to operating modes in deprecation Table.
• Fix link in Build packs doc

User facing changes

See docs preview url.

Next PRs.

n/a

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes unit tests
• Mentions any output changes.
• Adds documentation as needed: user docs, YAML reference, CLI reference.
• Adds integration tests if needed.

See the contribution guide for more details.

Double check this list of stuff that's easy to miss:

• If you are adding a example to the examples dir, please copy them to integration/examples
• Every new example added in integration/examples dir, should be tested in integration test

Reviewer Notes

• The code flow looks good.
• Unit test added.
• User facing changes look good.

Release Notes
n/a

[container-tools-bot]

Please visit http://35.236.38.41:1313 to view changes to the docs.

[balopat]

Looks good - we just need to make sure we keep using relref everywhere for better link validation

[codecov]

Codecov Report

Merging #3064 into master will increase coverage by 0.19%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
pkg/skaffold/build/cluster/logs.go	16.66% <0%> (-3.34%)	⬇️
pkg/skaffold/build/bazel/dependencies.go	78.43% <0%> (-2.34%)	⬇️
cmd/skaffold/app/cmd/config.go	100% <0%> (ø)	⬆️
pkg/skaffold/build/parallel.go	94.36% <0%> (ø)	⬆️
pkg/skaffold/build/local/local.go	33.33% <0%> (ø)	⬆️
pkg/skaffold/jib/jib_gradle.go	100% <0%> (ø)	⬆️
pkg/skaffold/build/custom/dependencies.go	83.33% <0%> (ø)	⬆️
pkg/skaffold/build/cluster/secret.go	36.2% <0%> (ø)	⬆️
pkg/skaffold/debug/debug.go	43.33% <0%> (ø)	⬆️
pkg/skaffold/build/custom/custom.go	62.5% <0%> (ø)	⬆️
... and 75 more