fix: improve linking on OIDC signup

[jonas-jonas]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[hperl]

LGTM with some minor comments.

[hperl]

LGTM!

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.54%. Comparing base (168a3f6) to head (9dc0cd9).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
selfservice/strategy/oidc/strategy.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4314      +/-   ##
==========================================
- Coverage   78.56%   78.54%   -0.02%     
==========================================
  Files         381      381              
  Lines       27452    27454       +2     
==========================================
- Hits        21567    21565       -2     
- Misses       4252     4254       +2     
- Partials     1633     1635       +2     

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