chore: applied january doc theme updates
(cherry picked from commit da34647)

Rename _index.md to index.md

Update syslog image tag

Bumps nginx from 1.21.5 to 1.21.6.

---
updated-dependencies:
- dependency-name: nginx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Bumps library/nginx from 1.21.5-alpine to 1.21.6-alpine.

---
updated-dependencies:
- dependency-name: library/nginx
  dependency-type: direct:production
  update-type: version-update:semver-patch
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…in /build (#2397)

* Bump opentracing/nginx-opentracing in /build

Bumps opentracing/nginx-opentracing from nginx-1.21.5 to nginx-1.21.6.

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updated-dependencies:
- dependency-name: opentracing/nginx-opentracing
  dependency-type: direct:production
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* fix alpine

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Co-authored-by: Luca Comellini <luca.com@gmail.com>

* Bump alpine from 3.14 to 3.15 in /build

Bumps alpine from 3.14 to 3.15.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
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KIC March 2022 theme bump staging

(cherry picked from commit fab9b55)

…ranch (#2530) (#2531)

- Fix broken links reported by field
- Update link target text so that instead of using "here", they have descriptions of the target documents. This is especially important when linking out to external locations (like the Docker docs)
- Use hugo `relref` for internal doc links -- when these are used, hugo build will fail if the link is broken
- Change "e.g." to "for example" -- brings us into compliance with internal style guide