Extends Matomo Analytics

[dpfens]

Adds the following Matomo enhancements:

• Releases - Track filtering by year as custom Events
• News - Track filtering by year and category as custom Events
• Projects/Repositories
  • Track filtering by category as custom Events
  • Track searches by category and query in Matomo site search, along with number of total results
  • Track impressions/clicks to distinguish which projects/repositories have been seen by a user in their search results

Other enhancements:

• Removes an extraneous accordion class from the contributions page to prevent a duplicate Accordion action from being recorded in Matomo
• Corrects a variable definition

[dpfens]

@hauten the above content impression tracking can be extended to the news and release stories without much difficulty (if you are interested)