improve accessibility of wiki show and new wiki

[Tlazypanda]

Fixes #7988

Improved accessibility of wiki show and new wiki by adding aria-labels for empty links and form labels for inputs in new wiki.

• 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

Screenshots

Before

After

Thanks!

[Tlazypanda]

I have intentionally not added alt text for images since that will vary for every image 😅 so I need to figure out what to do about it ✌️

[codecov]

Codecov Report

Merging #7989 into main will increase coverage by 0.00%.
The diff coverage is 79.69%.

@@           Coverage Diff            @@
##             main    #7989    +/-   ##
========================================
  Coverage   82.04%   82.05%            
========================================
  Files          97      100     +3     
  Lines        5643     5773   +130     
========================================
+ Hits         4630     4737   +107     
- Misses       1013     1036    +23     

Impacted Files	Coverage Δ
app/controllers/application_controller.rb	92.30% <ø> (ø)
app/controllers/users_controller.rb	82.29% <ø> (ø)
app/mailers/admin_mailer.rb	90.90% <12.50%> (-9.10%)	⬇️
app/models/user.rb	86.44% <12.50%> (-4.61%)	⬇️
app/jobs/digest_spam_job.rb	33.33% <33.33%> (ø)
app/controllers/admin_controller.rb	80.00% <100.00%> (+1.94%)	⬆️
app/controllers/spam2_controller.rb	100.00% <100.00%> (ø)
app/controllers/stats_controller.rb	73.62% <100.00%> (ø)
app/controllers/tag_controller.rb	81.40% <100.00%> (ø)
app/helpers/spam2_helper.rb	100.00% <100.00%> (ø)
... and 4 more

[VladimirMikulic]

That's an improvement for sure. Once you add alt for text images I'll approve the PR :)
Take your time, no worries.

[jywarren]

Looking great so far!!!!! Thanks @Tlazypanda and thanks @VladimirMikulic !!

[jywarren]

trying to re-trigger tests!

[jywarren]

OK! Any final changes before merging? Thank you!

[Tlazypanda]

@jywarren I haven't added the alternate text for images here but I am planning to do it in another pr 😅

[jywarren]

Merging this one! Thanks!!!

[cesswairimu]

Great 🎉 🎉