add meta tag to warn bots not to index revision pages

[RuthAtem]

add meta tag to warn bots not to index revision pages

Fixes #10946

Make sure these boxes are checked before your pull request (PR) is ready to be reviewed and merged. Thanks!

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updation
• ask @publiclab/reviewers for help, in a comment below

[welcome]

Thanks for opening this pull request! This space is protected by our Code of Conduct - and we're here to help.
Dangerbot will test out your code and reply in a bit with some pointers and requests.
Also please refer here for installation help 💿
There may be some errors, but don't worry! We'll work through them with you! 👍🎉😄


One thing that can help to get started is to make sure you've included a link back to the original issue you're solving, in the format fixes #0000 (for example). And to make sure the PR title describes what you're trying to do! (often it can be the same as the issue title) Thanks! 🙌


Then, you can say hello in our chatroom & share a link to this PR to get a review! 👋 ✅

[gitpod-io]

[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/6056524766/artifacts/208966495

[RuthAtem]

hi, @jywarren @TildaDares please review my PR thanks!!

[codeclimate]

Code Climate has analyzed commit be0aecc and detected 0 issues on this pull request.

View more on Code Climate.

[codecov]

Codecov Report

Merging #11008 (be0aecc) into main (cf10caa) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #11008      +/-   ##
==========================================
- Coverage   82.45%   82.45%   -0.01%     
==========================================
  Files          98       98              
  Lines        5991     5990       -1     
==========================================
- Hits         4940     4939       -1     
  Misses       1051     1051              

Impacted Files	Coverage Δ
app/api/srch/search.rb	70.51% <0.00%> (-0.19%)	⬇️

[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/6060017978/artifacts/209165591

[TildaDares]

Thanks @RuthAtem. This is perfect!!

[RuthAtem]

Thank you. I'm so happy

[welcome]

Congrats on merging your first pull request! 🙌🎉⚡️
Your code will likely be published to PublicLab.org in the next few days, but first it will be published to https://stable.publiclab.org/ (it will take some minutes for this to load, and until then you may see logs from the build process). Please test out your work on this testing server and report back with a comment that all has gone well!
Do join our weekly check-in to share your this week goal and the awesome work you did 😃. Please find the link to our latest check-in here 📝
Now that you've completed this, you can help someone else take their first step!
Reach out to someone else working on theirs on Public Lab's code welcome page (where you'll now be featured as a recent contributor!). Thanks!

Help others take their first step

Now that you've merged your first pull request, you're the perfect person to help someone else out with this challenging first step. 🙌

https://code.publiclab.org

Try looking at this list of `first-timers-only` issues, and see if someone else is waiting for feedback, or even stuck! 😕

People often get stuck at the same steps, so you might be able to help someone get unstuck, or help lead them to some documentation that'd help. Reach out and be encouraging and friendly! 😄 🎉

Read about how to help support another newcomer here, or find other ways to offer mutual support here.

[TildaDares]

Congratulations @RuthAtem🎉

[RuthAtem]

Thanks again @TildaDares 💃💃