Set version to v3.0.0a1

Merge branch 'master' into v2.3.x

Fix package name

We specify it twice because GitHub wouldn't recognise the spaCy repo as a package (e.g. for its "used by" stats) if it didn't specify the name inline

Documentation updates for v2.3.0 (explosion#5593)

* Update website models for v2.3.0

* Add docs for Chinese word segmentation

* Tighten up Chinese docs section

* Merge branch 'master' into docs/v2.3.0 [ci skip]

* Merge branch 'master' into docs/v2.3.0 [ci skip]

* Auto-format and update version

* Update matcher.md

* Update languages and sorting

* Typo in landing page

* Infobox about token_match behavior

* Add meta and basic docs for Japanese

* POS -> TAG in models table

* Add info about lookups for normalization

* Updates to API docs for v2.3

* Update adding norm exceptions for adding languages

* Add --omit-extra-lookups to CLI API docs

* Add initial draft of "What's New in v2.3"

* Add new in v2.3 tags to Chinese and Japanese sections

* Add tokenizer to migration section

* Add new in v2.3 flags to init-model

* Typo

* More what's new in v2.3

Co-authored-by: Ines Montani <ines@ines.io>

Set version to v2.2.4

Set version to v2.2.2

Set version to v2.1.9

Set version to v2.2.1

Set version to v2.2.0