Update the icons package docs

[oliverschuerch]

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1. On the page Serve the icons within your application update the sections Angular wrapper package and Declare manually Web components to point out, this are two different ways how to add components to your angular app.
2. Move the section Serve the icons within your application from the page Getting Started/Angular to the page Getting Started/Packages/Icons and merge it with the section Copy & paste the icons with a postinstall script.
3. Update the title of the merged section to something like Selfhosting the icons.
4. Point out, the difference between a vanillaJS setup (which will need the postinstall script) and the angular way to serve the icons.
5. Point out, that the copied /assets/post-icons folder needs to be served by a dev server and be available in the dist folder, to be accessible from the int/prod server.
6. Remove the section Serve the icons wihin an Angular application above.