Edits for page 1

[wurli]

• Recommend {S7} for formal classes
• Remove reference to {bslib}
• Weird spacing in 4th blue box from the top in bottom left section
• Suggest using {constructive} in reprex section
• Maybe qualify suggestion of Title_Snake_Case for column names - suggest that something other than snake_case is fine to differentiate from normal variables, so long as it's consistent. Title_Snake_Case just one option - camelCase is another.
• Dotted box alignment in 'writing functions: workflow'. Maybe just get rid of these.