Remove installation of unnecessary pandoc and tex OS packages

Fix pyspark path

Add `ROOT_CONTAINER` to base-notebook

Fix contributing doc make image -> make build

Use the preferred spark download mirror

Bump to spark 2.4.5 + minor improvements

Remove sparklyr from datascience notebook

[ci skip] Show jupyter/datascience-notebook tags on the wiki

Follow on from #998

Translate '/docs/locale/en/LC_MESSAGES/index.po' in 'pt_BR'

translation completed for the source file '/docs/locale/en/LC_MESSAGES/index.po'
on the 'pt_BR' language.

Create apply_tags

Bump version of R packages

Co-Authored-By: Peter Parente <parente@gmail.com>

Co-Authored-By: Peter Parente <parente@gmail.com>

Add another layer of abstraction to the base container, namely the root container `ROOT_CONTAINER`, so that the user can have the flexibility to build the whole series of images with `make` based on a different base image.

Address code review.
- Added apply_tags to post_push
- Verified output for versions