refactor: add async loading for better performance

[elevatebart]

Extract the Markdown parser to an asynchronous implementation, improving content parsing efficiency and enabling dynamic imports for better performance.

Make all routes loaded async

All the files

From globally -- 34.18MB of js
To globally ----- 28.97MB of js

Main file

From index.js at 16.28MB
To index at 6.28MB

[tchiotludo]

Can you make all markdown async and remove totally the sync version ?
Even better if we could remove markdownIt, we have 2 markdown parser inside the application, we should keep only one

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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