Create demo content for paragraphs library

Paragraphs Collection it is!

So for the demo content are we adding a new module paragraphs_library_demo or extending paragraphs_collection_demo?

I would say that we do it in paragraphs collection demo.

Not sure how best to show the library content. Here is some initial patch.

Good start. Not sure how to make it a bit more clear what we're doing here. Perhaps the idea described in the second item below...?

1. +++ b/modules/paragraphs_collection_demo/paragraphs_collection_demo.install
   @@ -191,6 +192,33 @@ function paragraphs_collection_demo_install() {
   +  $library_text_paragraph = Paragraph::create([
   

   We started adding comments like
   // PARAGRAPH DEMO ITEM: library items.
   to the install file to have a bit more readable code.

2. +++ b/modules/paragraphs_collection_demo/paragraphs_collection_demo.install
   @@ -191,6 +192,33 @@ function paragraphs_collection_demo_install() {
   +      'value' => 'This is content from the library.',
   

   Hm, I was thinking that if we want to really demonstrate this a bit better, we could add this library item two times and expand the text saying that this is in fact the same content that has been reused.

I think the demo will / should host multiple nodes. So following the real use cases, we should reuse the library item simply on two nodes.

The library item should contain regular paragraphs. I would just add the statement as last paragraph in the item that it is from the library.

Added comment and improved library item text.

Committed, thanks!