[docs] Improve exemplars tutorial

[reyang]

Made it more self-contained (not depending on the ./examples which have lots of unrelated code).
Removed the docker requirement.
Switched to Jaeger (which is more aligned with the opentelemetry-demo project).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.77%. Comparing base (6250307) to head (9c43b72).
Report is 237 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5636      +/-   ##
==========================================
+ Coverage   83.38%   85.77%   +2.38%     
==========================================
  Files         297      254      -43     
  Lines       12531    11036    -1495     
==========================================
- Hits        10449     9466     -983     
+ Misses       2082     1570     -512     

Flag	Coverage Δ
unittests	?
unittests-Solution-Experimental	85.76% <ø> (?)
unittests-Solution-Stable	85.45% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 116 files with indirect coverage changes

[cijothomas]

Made it more self-contained (not depending on the ./examples which have lots of unrelated code). Removed the docker requirement. Switched to Jaeger (which is more aligned with the opentelemetry-demo project).

Agree with all except removing docker requirement. Please keep it as optional, for those who prefer a single cmd over running multiple exes!

[CodeBlanch]

LGTM

[rajkumar-rangaraj]

LGTM