docs: pin v2.19.4 and add its changelog entry - #66

Changed pages include:

• index.html - view
• rules/index.html - view
• projects/index.html - view
• privacy/index.html - view
• migration/index.html - view
• blog/index.html - view
• changelog/index.html - view
• getting-started/index.html - view
• example/index.html - view
• configuration/index.html - view

There are more changes not included in the list