fix: doc requirements

docs/check.Dockerfile

@@ -1,5 +1,4 @@
-
-FROM alpine:3.10 as alpine
+FROM alpine:3.15 as alpine
 
 RUN apk --no-cache --no-progress add \
     libcurl \
@@ -9,7 +8,7 @@ RUN apk --no-cache --no-progress add \
     ruby-ffi \
     ruby-json \
     ruby-nokogiri
-RUN gem install html-proofer --version 3.13.0 --no-document -- --use-system-libraries
+RUN gem install html-proofer --version 3.19.3 --no-document -- --use-system-libraries
 
 # After Ruby, some NodeJS YAY!
 RUN apk --no-cache --no-progress add \

docs/requirements.txt

@@ -5,3 +5,22 @@ mkdocs-material==4.4.3
 markdown-include==0.5.1
 mkdocs-exclude==1.0.2
 Jinja2==3.0.0
+
+click==8.1.3
+csscompressor==0.9.5
+htmlmin==0.1.12
+importlib-metadata==4.12.0
+jsmin==3.0.1
+livereload==2.6.3
+Markdown==3.3.7
+MarkupSafe==2.1.1
+mkdocs-exclude==1.0.2
+mkdocs-minify-plugin==0.5.0
+pep562==1.1
+Pygments==2.12.0
+pymdown-extensions==6.1
+PyYAML==6.0
+six==1.16.0
+tornado==6.2
+typing-extensions==4.3.0
+zipp==3.8.1