chore: Replace "cocur/slugify" with Symfony String on website

[stloyd]

That library is not too active in maintenance, and we already use Symfony String across Flow, which provides us support for slugger.

Change Log

---

Added

Fixed

Changed

• Replace "cocur/slugify" with Symfony String on website

Removed

Deprecated

Security

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.38%. Comparing base (1459485) to head (1e9d575).
⚠️ Report is 5 commits behind head on 1.x.

Additional details and impacted files

@@            Coverage Diff             @@
##              1.x    #2019      +/-   ##
==========================================
+ Coverage   78.94%   79.38%   +0.43%     
==========================================
  Files         846      846              
  Lines       25235    25235              
==========================================
+ Hits        19923    20033     +110     
+ Misses       5312     5202     -110     

Components	Coverage Δ
etl	88.50% <ø> (+1.08%)	⬆️
cli	85.96% <ø> (ø)
lib-array-dot	95.00% <ø> (ø)
lib-azure-sdk	60.39% <ø> (ø)
lib-doctrine-dbal-bulk	95.14% <ø> (ø)
lib-filesystem	80.68% <ø> (ø)
lib-types	89.49% <ø> (+1.75%)	⬆️
lib-parquet	68.35% <ø> (ø)
lib-parquet-viewer	83.04% <ø> (ø)
lib-snappy	90.18% <ø> (+0.46%)	⬆️
bridge-filesystem-async-aws	91.00% <ø> (ø)
bridge-filesystem-azure	89.47% <ø> (ø)
bridge-monolog-http	96.91% <ø> (ø)
bridge-openapi-specification	94.55% <ø> (ø)
symfony-http-foundation	73.17% <ø> (ø)
adapter-chartjs	86.36% <ø> (ø)
adapter-csv	89.08% <ø> (ø)
adapter-doctrine	90.97% <ø> (ø)
adapter-elasticsearch	97.17% <ø> (ø)
adapter-google-sheet	91.40% <ø> (ø)
adapter-http	67.36% <ø> (ø)
adapter-json	89.80% <ø> (ø)
adapter-logger	83.33% <ø> (ø)
adapter-meilisearch	97.87% <ø> (ø)
adapter-parquet	78.30% <ø> (ø)
adapter-text	88.09% <ø> (ø)
adapter-xml	83.07% <ø> (ø)

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