Use a dediacted color in light theme for links in admonitions, so it is visible in all admonitions. (#64)

Revert "Downgrade higlight.js version and use old function notation to be ie11 compatible (#58)" (#59)

This reverts commit bd7a0eb7.

* Update bold policy and dark higlight color

* update color

relates to https://github.com/bonitasoft/bonita-documentation-site/issues/211

This is now 'bonita-documentation-site'.

We don't want to display such links in documentation archives we want to make
available for download only.
In this case, the documentation content source code is not available locally
so keeping the links is just misleading.

For single component version archive, this is not need as we have a single
component. In addition, the link produced for component in this list doesn't
work for local file browsing.

Co-authored-by: Thomas Bouffard <27200110+tbouffard@users.noreply.github.com>
Co-authored-by: Macbook Adrien - Bonita <adrien.lachambre@bonitasoft.com>