website/integrations: clarify some steps Nextcloud SAML

[Neriderc]

I've updated the steps to provide some clarity around certain areas that tripped me up as a newcomer to authentik trying to follow these instructions.

[netlify]

✔️ Deploy Preview for authentik ready!

🔨 Explore the source changes: 5d35ad4

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😎 Browse the preview: https://deploy-preview-2222--authentik.netlify.app

[codecov]

Codecov Report

Merging #2222 (5d35ad4) into master (ec04443) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2222      +/-   ##
==========================================
+ Coverage   91.60%   91.62%   +0.03%     
==========================================
  Files         447      447              
  Lines       19475    19475              
==========================================
+ Hits        17838    17842       +4     
+ Misses       1637     1633       -4     

Impacted Files	Coverage Δ
authentik/events/models.py	82.45% <0.00%> (-0.38%)	⬇️
authentik/admin/tasks.py	100.00% <0.00%> (+9.10%)	⬆️

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