docs: corrected some mistakes on demo documentation

[GramThanos]

The link to the Nodejs prerequisites is invalid (missing a slash) and also outdated.

[TimoGlastra]

Thanks 🙏

[codecov-commenter]

Codecov Report

Merging #1215 (b5b8ce0) into main (c697716) will decrease coverage by 1.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1215      +/-   ##
==========================================
- Coverage   87.59%   86.38%   -1.22%     
==========================================
  Files         734      734              
  Lines       17400    17400              
  Branches     2928     2928              
==========================================
- Hits        15242    15031     -211     
- Misses       2016     2199     +183     
- Partials      142      170      +28     

Impacted Files	Coverage Δ
...atures/src/signature-suites/BbsBlsSignature2020.ts	4.23% <0.00%> (-83.06%)	⬇️
...es/bbs-signatures/src/Bls12381g2SigningProvider.ts	14.81% <0.00%> (-81.49%)	⬇️
...s/src/signature-suites/BbsBlsSignatureProof2020.ts	8.06% <0.00%> (-73.39%)	⬇️

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[GramThanos]

There was one more small problem on the documentation.
Faber is the one able to Create connection invitation, not Alice.

One can see that Faber has the corresponding code:
https://github.com/hyperledger/aries-framework-javascript/blob/c697716bf1837b9fef307f60ff97f01d3d926728/demo/src/Faber.ts#L99