A problem with documentation is fixed [Sphinx]

---
It seems Sphinx does not support our new project structure.

So we will process an installed "instance" of testgres but not its source code.

Author: dmitry-lipetsk

docs/Makefile

@@ -17,4 +17,5 @@ help:
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile
+	@pip install --force-reinstall ..
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/source/conf.py

@@ -14,11 +14,19 @@
 #
 import os
 import sys
-sys.path.insert(0, os.path.abspath('../..'))
+import testgres
+
+assert testgres.__path__ is not None
+assert len(testgres.__path__) == 1
+assert type(testgres.__path__[0] == str)  # noqa: E721
+p = os.path.dirname(testgres.__path__[0])
+assert type(p) == str  # noqa: E721
+sys.path.insert(0, os.path.abspath(p))
 
 # -- Project information -----------------------------------------------------
 
 project = u'testgres'
+package_name = u'testgres'
 copyright = u'2016-2023, Postgres Professional'
 author = u'Postgres Professional'
 
@@ -55,7 +63,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.