JetNews updated to dev08

Changes:

• Refactored modifiers to use fluent style throughout
• Switched to new use Icon and Image composables
• Switch to using IconButton where appropriate
• Updated Scaffolding to use IconButton for navigationIcon
• Removed vector helpers from sample that are now included in the library
• Update typography of code paragraphs to expand, and avoid setting background
  on text in code blocks as alpha is not respected – use the background of the Box
• Replaced all Container with Box
• General code cleanup to remove nesting that can be replaced with modifiers
• Moved Modifiers to first default argument to follow style
• Aligned bullets with baseline of text
• Sized bullets based on font scaling
• Removed many named arguments that were not required for readability
• Added note for bugfix related to font coloring requiring contentColor w/ link to b/143626708
• Use ColorFilter.tint to semantically tint vectors
• Continue using Modifier.None for default arguments which is the style in dev08, this is likely to be replaced with Modifier in dev09