Updated pipeline documentation and results for viralrecon, MAG and PikaVirus

[svarona]

PR checklist

• [X] This comment contains a description of changes (with reason).
• [ ] Make sure your code lints (black and flake8).
• If a new tamplate was added make sure:
  • [ ] Template's schema is added in templates/services.json.
  • [X] Template's pipeline's documentation in assets/reports/md/template.md is added.
  • [X] Results Documentation in assets/reports/results/template.md is updated.
• [X] CHANGELOG.md is updated.
• [ ] README.md is updated (including new tool citations and authors/contributors).
• [ ] If you know a new user was added to the SFTP, make sure you added it to templates/sftp_user.json

PR description

Updated markdown of pipeline documentation and results for viralrecon, MAG and PikaVirus (Task related to https://github.com/BU-ISCIII/BU-ISCIII/issues/45, https://github.com/BU-ISCIII/BU-ISCIII/issues/48, https://github.com/BU-ISCIII/BU-ISCIII/issues/57 and https://github.com/BU-ISCIII/buisciii-tools/issues/4)