Blockstore and all of its (experimental) functionality has been replaced with
openedx-learning, aka "Learning Core". This commit uninstalls the now-unused
openedx-blockstore package and removes all dangling references to it.
Note: This also removes the `copy_library_from_v1_to_v2` management command,
which has been broken ever since we switched from Blockstore to Learning Core.
Part of this DEPR: https://github.com/openedx/public-engineering/issues/238
paver for js test is discussed below separately
python testing is covered well in the next section, running all python
tests is not useful for development loops
Now that the content in `guides` is all of the edx-platform docs, move
them all into the top-level docs directory to reduce confusion.
BREAKING CHANGE: Guides are now just docs. This will require updating
the publishing settings so that RTD looks for the conf in a different
location.
