Use a local server (fixture) for the attestation example

[heeckhau]

Use server fixture for tlsn examples + removed Discord example

The attestation example now has different modes: json, html and authenticated

[codecov]

Codecov Report

Attention: Patch coverage is 5.26316% with 18 lines in your changes missing coverage. Please review.

Project coverage is 54.48%. Comparing base (d157325) to head (96e3b8b).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
crates/server-fixture/server/src/lib.rs	5.26%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #656      +/-   ##
==========================================
- Coverage   54.53%   54.48%   -0.05%     
==========================================
  Files         193      193              
  Lines       20599    20618      +19     
==========================================
+ Hits        11233    11234       +1     
- Misses       9366     9384      +18     

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[th4s]

I tried to follow the instructions but got

Error: Os { code: 111, kind: ConnectionRefused, message: "Connection refused" }

when executing attestation_prove.

[th4s]

Now it works ^^, forgot PORT :)

[th4s]

Nice!