The current tracking section had a few issues:
* When browsing as an admin, this section becomes useless since no
investments are shown
* Browsing investments in the admin section, you're suddenly redirected
to the tracking section, making navigation confusing
* One test related to the officing dashboard failed due to these changes
and had been commented
* Several views and controller methods were copied from other sections,
leading to duplication and making the code harder to maintain
* Tracking routes were defined for proposals and legislation processes,
but in the tracking section only investments were shown
* Probably many more things, since these issues were detected after only
an hour reviewing and testing the code
So we're removing this untested section before releasing version 1.1. We
might add it back afterwards.
Note we usually cannot make it simple because officer assignments are
usually assigned to both a poll and a booth, and on a certain date.
However, in the few cases where the booth nor the date don't matter, we
can make the code a bit easier to read.
While in theory we wouldn't need to use the `transient` nor the
`after(:create)` because there's already a `has_many :through`
association with followers, Factory Bot / ActiveRecord don't
automatically associate the followable, resulting in an invalid record
exception.
