Remove hledger
Originally created by @sajolida on #11346 (Redmine)
We added hledger in 30fb3260 for our accountants, since then things have changed quite a bit:
- hledger is available in Jessie and works with additional packages
- our accountants use additional packages with no problem
So I propose we remove hledger from Tails.
Feature Branch: feature/11346-remove-hledger