Resolve "Add online generation of mermaid graph"

Closes #14

See merge request david.dorchies/fairify!1

Refs #14

Fix #10

Closes #10

- already have pandoc installed
- use devel for CRAN check purpose

Refs #8

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They will be add later waiting for operational configuration.

Refs #2

Refs #9

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

Refs #3

Refs #8

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Refs #1

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Refs #1