Address other PDF generation concerns related to simplicity and compatibility

[rahmatkhah]

Describe the bug
Two bugs:

• not working on PowerPC
• result PDF does not contain strings, i.e. cannot use pdfgrep, strings, text is not highlightable nor copy-paste-able

Moreover, Webkit is rather bloated (overkill for this task).
A re-implementation with LaTeX or just leaving the output as HTML is preferred.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
Ability to select and/or highlight texts in generated PDFs.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Docker (please complete the following information):

• Docker version: [e.g. 20.10.10, build b485636]
• docker-compose version: [e.g. 1.29.2, build 5becea4c]

Additional context
FNNDSC/pl-covidnet-pdfgeneration