Improved text for welcome contribution notice

[Jennifer-tech]

Improved text for welcome contribution notice

Fixes #11424

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• screenshots/GIFs are attached 📎 in case of UI updation
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[gitpod-io]

[codeclimate]

Code Climate has analyzed commit e734aa2 and detected 0 issues on this pull request.

View more on Code Climate.

[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/8701410602/artifacts/392799433

[codecov]

Codecov Report

Merging #11462 (e734aa2) into main (5d94500) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11462   +/-   ##
=======================================
  Coverage   83.21%   83.21%           
=======================================
  Files          93       93           
  Lines        5772     5772           
=======================================
  Hits         4803     4803           
  Misses        969      969           

Impacted Files	Coverage Δ
app/controllers/images_controller.rb	72.50% <100.00%> (ø)

[TildaDares]

Hi @Jennifer-tech, contributors are only allowed to work on one FTO. Since you've already worked on one, I think we should leave this for a first-timer to work on. Thank you!