RELEASE: v0.15.1 + BUG: Issue warning for sphinxcontrib-bibtex + docu…

…tils>=0.18,<0.20 (jupyter-book#1965)

* pin docutils < 0.18 (mcmtroffaes/sphinxcontrib-bibtex#322)

* Prep for v0.15.1

* rework, issue warning rather than force version pin on docutils

* only test html if no warnings

* doc: add entry for citations page

* update changelog

RELEASE: v0.15.0 (jupyter-book#1963)

* RELEASE: v0.15.0

* review docs related to theme keyword

DOCS: Fix table and formatting in CHANGELOG (jupyter-book#1947)

* DOCS: fix minor table formatting issue in CHANGELOG

* update to format

Release v0.13.2 (jupyter-book#1927)

[Release] Prepare for v0.13.1 (jupyter-book#1809)

RELEASE: v0.13.0 (jupyter-book#1739)

* RELEASE: v0.13.0

* fix typo

* Update CHANGELOG.md

Co-authored-by: Chris Holdgraf <[email protected]>

Co-authored-by: Chris Holdgraf <[email protected]>

RELEASE: v0.12.3 (jupyter-book#1682)

RELEASE: v0.12.2 (jupyter-book#1641)

RELEASE: Setup and Changes for v0.12.1 (jupyter-book#1542)

🚀 RELEASE: Setup and Changes for v0.12 (jupyter-book#1494)

* RELEASE: update to v0.12

* add myst_deprecations notification to CHANGELOG

* update CHANGELOG

* fix myst-nb intersphinx link

* FIX: broken links to myst-nb due to executablebooks/MyST-NB#365

* add thanks to contributors

* update thanks

* Sphinx 4 in github actions

* upgrade win, os x tests to python=3.8; and pypi publish workflow

* update cache key to be more generic

* use a simple test matrix to set python-version

* FIX: add $

Co-authored-by: Chris Holdgraf <[email protected]>