Fix CONTRIBUTING.md and update

[taieeuu]

Tracking issue

Reference #5868

Why are the changes needed?

Fix error link.And add the Recommendation Order for begineers

What changes were proposed in this pull request?

For information related to contributing to Flyte, please check out the [Contributing to Flyte](https://docs.flyte.org/en/latest/community/contribute/index.html) section of the documentation.

## Recommendation Order (For Beginners)
* Setup dev environment 
* Read the following and try to run 10 examples
    * https://docs.flyte.org/en/latest/user_guide/introduction.html
    * https://docs.flyte.org/en/latest/flytesnacks/userguide.html
* Finish reading the [Concepts](https://docs.flyte.org/en/latest/user_guide/concepts/main_concepts/index.html)
* Finish reading the [Control Plane](https://docs.flyte.org/en/latest/user_guide/concepts/control_plane/index.html)
* Finish reading the [Component Architecture](https://docs.flyte.org/en/latest/user_guide/concepts/component_architecture/index.html)
* Choose 2 good first issues from the following and start solving them with the knowledge you have read.
* Familiar with using DOCKERFILE to push images to localhost for development

Check all the applicable boxes

• [ x ] I updated the documentation accordingly.
• [ x ] All new and existing tests passed.
• [ x ] All commits are signed-off.

Related PRs

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[davidmirror-ops]

Great, thanks for taking the initiative!

[davidmirror-ops]

Do you think we could lower the barrier here? Any number is arbitrary at this point so maybe something like "Run at least one example and pay close attention to effects: generated outputs, the Graph view, tasks logs, etc. Repeat with as many examples as you need to have an initial understanding of what an execution looks like" wdyt?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.81%. Comparing base (595c552) to head (60b0d31).
Report is 14 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5873      +/-   ##
==========================================
- Coverage   36.81%   36.81%   -0.01%     
==========================================
  Files        1309     1309              
  Lines      130893   130895       +2     
==========================================
  Hits        48185    48185              
- Misses      78526    78528       +2     
  Partials     4182     4182              

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.03% <ø> (ø)
unittests-flytecopilot	11.73% <ø> (ø)
unittests-flytectl	62.40% <ø> (ø)
unittests-flyteidl	6.92% <ø> (ø)
unittests-flyteplugins	53.59% <ø> (-0.01%)	⬇️
unittests-flytepropeller	43.00% <ø> (ø)
unittests-flytestdlib	55.41% <ø> (ø)

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[davidmirror-ops]

While not the examples follow it today, we try to make ImageSpec first, and trying to avoid Dockerfiles

[welcome]

Congrats on merging your first pull request! 🎉