CSS from main.css is extracted to bootstrap.css

[matt-gadd]

Bug

Expected behavior:
CSS included in main.css is outputted to the main.css bundle.

Actual behavior:
CSS is output to the bootstrap.css bundle.

[maier49]

Although this should be straight forward, just moving the main.css to a different entry for the multi bundle scenario, the bootstrap plugin complicates the scenario since it dynamically loads "main.tsx" and having a main entry is therefore not allowed. May need to add this dependency explicitly in a plugin, or consider adding the import to index.html explicitly in the app template.