Backports various fixes and tests from Berry - #327

Changed pages include:

• getting-started.html - view
• playground.html - view
• protocols.html - view
• welcome.html - view
• advanced/architecture.html - view
• advanced/changelog.html - view
• advanced/contributing.html - view
• advanced/lexicon.html - view
• advanced/lifecycle-scripts.html - view
• advanced/pnp-spec.html - view

There are more changes not included in the list