fix: _ORY_SDK_URL to ORY_SDK_URL

[productdevbook]

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• 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 approval (please contact security@ory.sh) 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 the necessary documentation within the code base (if appropriate).

Further comments

[vercel]

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[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 53.83%. Comparing base (f3fad4d) to head (b8fc6d8).
Report is 223 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #562       +/-   ##
===========================================
+ Coverage   42.43%   53.83%   +11.40%     
===========================================
  Files         136      159       +23     
  Lines        2008     2922      +914     
  Branches      288      450      +162     
===========================================
+ Hits          852     1573      +721     
- Misses       1149     1320      +171     
- Partials        7       29       +22     

Components	Coverage Δ
@ory/elements-react	52.17% <ø> (+15.38%)	⬆️
@ory/nextjs	62.52% <ø> (-3.46%)	⬇️

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[aeneasr]

Thank you, this looks great! Could you please sign the CLA (just two clicks), then we can merge it right away!

[productdevbook]

I signed