Fixed issues for CRAN submission and pushrelease actions

[BBieri]

Description

Package

• Fixed invalid URLs mentioned in the CRAN comments
• Fixed case-sensitive path extension for Linux checks in various vignettes
• Fixed various issues in the pushrelease workflow
  • Release action was fixed by updating tag creation action
  • Setup-R action was updated to v2
  • Installing Xquartz dependency for macOS runner building the website since
    the latest version of {pdftools} requires it
• Packages used in GitHub Actions were moved to suggests in Description

Checklist:

• PR form
  • I have given this pull request an informative title
  • Description above itemizes changes under subtitles, e.g. "## Collection""
  • Any closed, fixed, or related issues are referenced and explained in the description above, e.g. "Fixed #0 by adding A"
  • Package builds on my OS without issues
• PR checks all pass for latest commit
  • Package builds on Mac
  • Package builds on Windows
  • Package builds on Linux
  • CodeCov check: Package improves or maintains good test coverage
  • CodeFactor check: Package improves or maintains good style
• Documentation
  • Any new or modified functions or data have roxygen style documentation in their .R scripts
  • Any longer functions are commented inline so that it is easier to debug in the future
  • PR description above and the NEWS.md file are aligned
  • DESCRIPTION file version is bumped by the appropriate increment (major, minor, patch)

[codecov]

Codecov Report

Merging #123 (c63fa13) into main (65b733a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #123   +/-   ##
=======================================
  Coverage   52.22%   52.22%           
=======================================
  Files          13       13           
  Lines         404      404           
=======================================
  Hits          211      211           
  Misses        193      193           

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