add link to it and rephrase some sentences.

Add methods to store consecutive destination failures and retrieve
the destinations that are still functional.
Since destinations can fail because of Tor circuits, it's not count
individual failures but consecutives one.
Also exit with error if there are no functional destinations left.
The maximum number of consecuitve failures is set to 10, but it
may need to be changed depending on the percentage of circuits and
requests that fail.

based on Torflow's documentation.

Closes bug #28647. Bugfix v0.4.0

Closes #28649.

or Markdown. Also change links to be interpreted by GitHub and
remove Sphinx directives in the main documentation pages.

Closes #28648.

it will have to be added again when there is a system package

GH: closes #90

Thanks teor and juga for feedback!