AIRR documentation is not draft anymore

Partially revert 41071da8.

Feature a/airr no clone

See merge request !345

Following a discussion with J. V. Heiden.

Feature a/3590 airr duplicate count

See merge request !343

See #3590.

Feature a/3572 3573 more airr fields

Closes #3573 and #3572

See merge request !338

Close #3572 and #3573.

See #3572 and #3573.

Add CDR3 cluster method

Closes #3542

See merge request !308

Feature s/docker ubuntu 18 04

See merge request !341

Forgot to commit this modification; which is necessary for building the
image with the 18.04 version of Ubuntu
See #3583

See #3583

doc/vidjil-algo.md: AIRR .tsv format, draft documentation

See merge request !332

Feature a/2828 output airr

See merge request !330

2FA

See merge request !340

See #3367

Feature a/3575 warning two assignations

Closes #3575

See merge request !333

See #3568.