Repairing renv database and adding dfeshiny functionality

[rmbielby]

Pull request overview

The app was throwing the following error on deploys:

── Deploying to server ─────────────────────────────────────────────────────────
Waiting for task: 1387423346
  error: Parsing manifest
## Begin Task Log ##############################################################
## End Task Log ################################################################
Error: Error: Unhandled Exception: child_task=1387423355 child_task_status=failed: Error parsing manifest: Unknown repository for package source: git
Execution halted
Error: Process completed with exit code 1.

Seemed to be down to a corrupted renv database, so I ran the following to clean it up:

renv::deactivate()
renv::init()
renv::update()
renv::snapshot()

Whilst I was in the repo, I also made some updates to bring in the latest standards on cookie consent and the support_panel.

Pull request checklist

Please check if your PR fulfils the following:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Tests have been run locally and are passing (run_tests_locally())
• Code is styled according to tidyverse styling (checked locally with tidy_code())