fix: quickstart curl examples

[vinckr]

This PR closes #1635 and we can create a separete issue/pr for a possible playground-based quickstart/tutorial.

• Changing instances of https://playground.projects.oryapis.com to local kratos
• Changing the login & registration payload examples so they work correctly.
• Changing the end section & next steps a bit
  (IMO we dont need to tease adding login with github to the quickstart, when we have a great step-by-step guide based on the quickstart already)

[codecov]

Codecov Report

Merging #1778 (7c54662) into master (b4972b1) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head 7c54662 differs from pull request most recent head 95abc56. Consider uploading reports for the commit 95abc56 to get more accurate results

@@            Coverage Diff             @@
##           master    #1778      +/-   ##
==========================================
- Coverage   74.13%   74.11%   -0.03%     
==========================================
  Files         260      260              
  Lines       12770    12733      -37     
==========================================
- Hits         9467     9437      -30     
+ Misses       2673     2669       -4     
+ Partials      630      627       -3     

Impacted Files	Coverage Δ
persistence/sql/persister_courier.go	85.00% <0.00%> (-3.34%)	⬇️
cmd/daemon/serve.go	83.33% <0.00%> (ø)
schema/schema.go	88.88% <0.00%> (+2.22%)	⬆️
schema/handler.go	93.33% <0.00%> (+8.85%)	⬆️

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[zepatrik]

Very nice 👍 ❤️

[vinckr]

Thanks for the review @zepatrik 👉 😋

[aeneasr]

Thank you, this looks great! The CI is failing because some files are formatted incorrectly. To format them, run:

$ make format
$ git commit -a -m "styles: format code"
$ git push

Thank you!

[vinckr]

Formatted, updated and included a fix for a small typo I found in concept docs.