add allow_duplicate_labels argument to render_report(s) which is FALSE by default in line with recommandation of https://bookdown.org/yihui/rmarkdown-cookbook/duplicate-label.html

Fix #34

Fix #31

Refs #29

Refs #29

Refs #29

Refs #8

Fix #24, #26

Refs #25

- call render_book via Rscript in order to not pollute the knitting environment with fairify package
- use before_chapter_script for setup a report
instead of letting the user put a call to setup.R in the Rmarkdown report.
- copy of templates is operated during knit by setup.R

Refs #25

See https://rdrr.io/cran/pkgload/man/load_all.html

Refs #23

- templates are copied from package inst/templates during render
- handling of dependencies between templates
- setup.R is template dependant now
- _output.yml is also template dependant and completed recursively through dependency chain

Refs #23

Fix #21

- extra folder .devcontainer
- non ascii characters
- remaining folder public after check

Refs #2

- correction of reports/.gitignore file creation
- resolve check issues

Refs #3