manual: update section on project structure, bump sphinx lib versions

doc/user/conf.py.in

@@ -49,6 +49,7 @@ extensions = [
     'sphinx.ext.todo',
     'sphinx_copybutton',
     'sphinxcontrib.rsvgconverter',
+    'sphinx-prompt',
     # 'sphinxcontrib.programoutput',
     # 'sphinxcontrib.devhelp',
     # 'recommonmark',

doc/user/invoking-from-command-line/intro.rst

@@ -1,4 +1,4 @@
-.. SPDX-FileCopyrightText: © 2020 Alexandros Theodotou <alex@zrythm.org>
+.. SPDX-FileCopyrightText: © 2020, 2023 Alexandros Theodotou <alex@zrythm.org>
    SPDX-License-Identifier: GFDL-1.3-invariants-or-later
    This is part of the Zrythm Manual.
    See the file index.rst for copying conditions.
@@ -52,14 +52,6 @@ Zrythm executable.
 
   Print version information.
 
-.. cmdoption:: --zpj-to-yaml
-
-  Convert a .zpj project file to YAML.
-
-.. cmdoption:: --yaml-to-zpj
-
-  Convert a YAML file to the .zpj format.
-
   Prints the Zrythm version.
 
 zrythm_launch

doc/user/projects/project-structure.rst

@@ -106,16 +106,17 @@ Project Directory
 
 Project File Format
 -------------------
-Zrythm uses a custom
-`MIME <https://en.wikipedia.org/wiki/MIME>`_ type
-``x-zrythm-project`` (which is an alias of
-``application/zstd``) for its project files
-(``project.zpj``).
-This is a
+Zrythm project files (``project.zpj``) are
 `zstd <https://facebook.github.io/zstd/>`_-compressed
-`YAML <http://yaml.org/>`_ file that can be
-decompressed (converted to YAML) for inspection using
-:option:`zrythm --zpj-to-yaml`.
+`JSON <https://www.json.org/>`_ files (the project file
+`MIME type <https://en.wikipedia.org/wiki/MIME>`_
+``x-zrythm-project`` is an alias of ``application/zstd``).
+
+Project files can be converted to JSON using:
+
+.. prompt:: bash
+
+   zstd -d project.zpj -o project.json
 
 Audio Pool
 ----------

requirements.txt

@@ -5,7 +5,7 @@ certifi==2023.7.22
 charset-normalizer==3.2.0
 click==8.1.6
 docutils==0.20.1
-furo==2023.7.26
+furo==2023.9.10
 gprof2dot==2022.7.29
 idna==3.4
 imagesize==1.4.1
@@ -16,15 +16,16 @@ Pygments==2.16.1
 requests==2.31.0
 snowballstemmer==2.2.0
 soupsieve==2.4.1
-Sphinx==7.1.2
+Sphinx==7.2.6
 sphinx-basic-ng==1.0.0b2
 sphinx-copybutton==0.5.2
 sphinx-intl==2.1.0
+sphinx-prompt==1.8.0
 sphinxcontrib-applehelp==1.0.6
 sphinxcontrib-devhelp==1.0.4
 sphinxcontrib-htmlhelp==2.0.3
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.5
-sphinxcontrib-serializinghtml==1.1.7
+sphinxcontrib-serializinghtml==1.1.9
 sphinxcontrib-svg2pdfconverter==1.2.2
-urllib3==2.0.4
+urllib3==2.1.0