upgrade build system and remove a no longer working command from Make

Makefile

@@ -9,9 +9,6 @@ ODKX_SRCDIR   = odkx-src
 COMPILE_X_SRCDIR = tmpx-src
 ODKX_BUILDDIR = odkx-build
 
-# Put it first so that "make" without argument is like "make help".
-help:
-	@$(SPHINXBUILD) -M help
 
 .PHONY: help Makefile
 

requirements.txt

@@ -5,35 +5,37 @@ blessings==1.7
 certifi==2020.12.5
 chardet==4.0.0
 click==7.1.2
+colorama==0.4.4
 docutils==0.16
 future==0.18.2
-gitdb==4.0.5
-GitPython==3.1.13
-idna>=2.5
+gitdb==4.0.7
+GitPython==3.1.14
+idna==3.1
 imagesize==1.2.0
-importlib-metadata==3.6.0
+importlib-metadata==3.8.1
 Jinja2==2.11.3
 livereload==2.6.3
 MarkupSafe==1.1.1
 packaging==20.9
 pathtools==0.1.2
-Pillow==8.1.1
+Pillow==8.1.2
+pip-review==1.1.0
 port-for==0.4
 proselint==0.10.2
 pyenchant==3.2.0
-Pygments==2.8.0
+Pygments==2.8.1
 pyparsing==2.4.7
 pytz==2021.1
 PyYAML==5.4.1
-requests==2.25.1
+requests==2.15.1
 Send2Trash==1.5.0
 six==1.15.0
-smmap==3.0.5
+smmap==4.0.0
 snowballstemmer==2.1.0
-Sphinx==3.5.1
-sphinx-autobuild==2020.9.1
+Sphinx==3.5.3
+sphinx-autobuild==2021.3.14
 sphinx-rtd-theme==0.5.1
-sphinx-tabs==2.0.1
+sphinx-tabs==2.1.0
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2
 sphinxcontrib-htmlhelp==1.0.3
@@ -42,6 +44,6 @@ sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.4
 sphinxcontrib-spelling==7.1.0
 tornado==6.1
-urllib3==1.26.3
+urllib3==1.26.4
 watchdog==2.0.2
-zipp==3.4.0
+zipp==3.4.1