Bump references to web-component to their current v1.6.4 version

[joanise]

PR Goal?

• web-c version is now 1.6.x
• bundle.js updated to the v1.6.4 bundle.js
• bundle.css was not updated when we reduced the size of material icon asset font files last year, doing it now

Fixes?

normal changes post publishing a new web-component version

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
readalongs/text/bundle.css	2% smaller
pyproject.toml	Unsupported file format
readalongs/text/bundle.js	Unsupported file format
readalongs/text/util.py	0% smaller

[github-actions]

CLI load time: 0:00.04
Pull Request HEAD: 732b756d40aa7a7f497af5f9e1d7565273ecd4de
No imports take more than 0.1 s.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.76%. Comparing base (5d48378) to head (732b756).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #310   +/-   ##
=======================================
  Coverage   93.76%   93.76%           
=======================================
  Files          21       21           
  Lines        1765     1765           
  Branches      295      295           
=======================================
  Hits         1655     1655           
  Misses         73       73           
  Partials       37       37           

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