docs(backport): Add NumFOCUS Affiliated Project to README (#2180)

* Backport PR #2179
* pyhf became a NumFOCUS Affiliated Project on 2022-12-19.
   - c.f. https://numfocus.org/sponsored-projects/affiliated-projects
* Add mention of being a NumFOCUS Affiliated Project to the Acknowledgements
  section.

README.rst

@@ -6,7 +6,7 @@
 pure-python fitting/limit-setting/interval estimation HistFactory-style
 =======================================================================
 
-|GitHub Project| |DOI| |JOSS DOI| |Scikit-HEP| |NSF Award Number|
+|GitHub Project| |DOI| |JOSS DOI| |Scikit-HEP| |NSF Award Number| |NumFOCUS Affiliated Project|
 
 |Docs from latest| |Docs from main| |Jupyter Book tutorial| |Binder|
 
@@ -351,6 +351,8 @@ Matthew Feickert has received support to work on ``pyhf`` provided by NSF
 cooperative agreement `OAC-1836650 <https://www.nsf.gov/awardsearch/showAward?AWD_ID=1836650>`__ (IRIS-HEP)
 and grant `OAC-1450377 <https://www.nsf.gov/awardsearch/showAward?AWD_ID=1450377>`__ (DIANA/HEP).
 
+``pyhf`` is a `NumFOCUS Affiliated Project <https://numfocus.org/sponsored-projects/affiliated-projects>`__.
+
 .. |GitHub Project| image:: https://img.shields.io/badge/GitHub--blue?style=social&logo=GitHub
    :target: https://github.com/scikit-hep/pyhf
 .. |DOI| image:: https://zenodo.org/badge/DOI/10.5281/zenodo.1169739.svg
@@ -361,6 +363,8 @@ and grant `OAC-1450377 <https://www.nsf.gov/awardsearch/showAward?AWD_ID=1450377
    :target: https://scikit-hep.org/
 .. |NSF Award Number| image:: https://img.shields.io/badge/NSF-1836650-blue.svg
    :target: https://nsf.gov/awardsearch/showAward?AWD_ID=1836650
+.. |NumFOCUS Affiliated Project| image:: https://img.shields.io/badge/NumFOCUS-Affiliated%20Project-orange.svg?style=flat&colorA=E1523D&colorB=007D8A
+   :target: https://numfocus.org/sponsored-projects/affiliated-projects
 .. |Docs from latest| image:: https://img.shields.io/badge/docs-v0.7.1-blue.svg
    :target: https://pyhf.readthedocs.io/
 .. |Docs from main| image:: https://img.shields.io/badge/docs-main-blue.svg
@@ -373,7 +377,7 @@ and grant `OAC-1450377 <https://www.nsf.gov/awardsearch/showAward?AWD_ID=1450377
 .. |PyPI version| image:: https://badge.fury.io/py/pyhf.svg
    :target: https://badge.fury.io/py/pyhf
 .. |Conda-forge version| image:: https://img.shields.io/conda/vn/conda-forge/pyhf.svg
-   :target: https://github.com/conda-forge/pyhf-feedstock
+   :target: https://prefix.dev/channels/conda-forge/packages/pyhf
 .. |Supported Python versions| image:: https://img.shields.io/pypi/pyversions/pyhf.svg
    :target: https://pypi.org/project/pyhf/
 .. |Docker Hub pyhf| image:: https://img.shields.io/badge/pyhf-v0.7.1-blue?logo=Docker