Use webpack bundled icon instead of GitHub hosted content

[dodo0822]

Problem

Currently the Events item in Sidenav uses the icon hosted in GitHub, which may cause issue with strict Content-Security-Policy settings.

Solution

One-line summary: use the icon SVG bundled by Webpack instead of linking to raw.githubusercontent.com.

Checklist

• [x] You've signed-off your work
• [ ] Your changes are accompanied by tests (if relevant)
• [x] Your change contains a small diff and is self-contained
• [ ] You've updated any relevant documentation (if relevant)
• [ ] You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• [ ] You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• [ ] You've included a header in any source code files (if relevant)

[boring-cyborg[bot]]

Thanks for opening your first pull request in the Marquez project! Please check out our contributing guidelines (https://github.com/MarquezProject/marquez/blob/main/CONTRIBUTING.md).

[netlify[bot]]

✅ Deploy Preview for peppy-sprite-186812 canceled.

Name	Link
🔨 Latest commit	59d0a5eedf5ed9584b062e61af338da8724639c7
🔍 Latest deploy log	https://app.netlify.com/sites/peppy-sprite-186812/deploys/663000865910b20008930c18

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.47%. Comparing base (ab46957) to head (3d3c7af).

:exclamation: Current head 3d3c7af differs from pull request most recent head 59d0a5e. Consider uploading reports for the commit 59d0a5e to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2803   +/-   ##
=========================================
  Coverage     84.47%   84.47%           
  Complexity     1429     1429           
=========================================
  Files           251      251           
  Lines          6460     6460           
  Branches        299      299           
=========================================
  Hits           5457     5457           
  Misses          850      850           
  Partials        153      153           

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[boring-cyborg[bot]]

Great job! Congrats on your first merged pull request in the Marquez project!