chore: correct tutorial doc link in readme

[vakalapa]

Tutorial doc link seems to be pointing to a non-existent file, correcting it and hope this file is the right one.

[CLAassistant]

All committers have signed the CLA.

[MattFrick]

I think this used to link to what is now: docs/sources/standalone.md
I agree it needs to be fixed as it stands out for those perusing on github. I didn't quite understand why it needed to be changed, but here's where it was changed: 1889a36

[grcevski]

LGTM! This looks good to me. @vakalapa can you please sign the CLA so we can merge this? Thanks for your contribution!

[codecov-commenter]

Codecov Report

Merging #227 (ef6b67e) into main (b4841e4) will decrease coverage by 42.71%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #227       +/-   ##
===========================================
- Coverage   80.65%   37.95%   -42.71%     
===========================================
  Files          37       35        -2     
  Lines        3066     2951      -115     
===========================================
- Hits         2473     1120     -1353     
- Misses        442     1765     +1323     
+ Partials      151       66       -85     

Flag	Coverage Δ
integration-test	?
unittests	37.95% <ø> (ø)

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see 30 files with indirect coverage changes

[grcevski]

Thanks again for your contribution @vakalapa