Switch docs to MKDocs (#602)

Fixes #601. Merged in 6f87b32 from the md3 branch and did a lot of cleanup.

Changes include:

* Removed old docs build tool, templates, etc.

* Added MkDocs config file, etc.

* filename.txt => filename.md

* pythonhost.org/Markdown => Python-Markdown.github.io

* Markdown lint and other cleanup.

* Automate pages deployment in makefile with `mkdocs gh-deploy`

    Assumes a git remote is set up named "pages". Do

        git remote add pages https://github.com/Python-Markdown/Python-Markdown.github.io.git

    ... before running `make deploy` the first time.

1 files changed, 4 insertions, 4 deletions

diff --git a/checkspelling.sh b/checkspelling.sh
index 4ae20cc..654fef0 100755
--- a/checkspelling.sh
+++ b/checkspelling.sh
@@ -1,14 +1,14 @@
 #!/bin/bash
 
 echo "Building docs..."
-python setup.py --quiet build_docs --force
+mkdocs build --clean
 echo "Compiling Dictionary..."
 aspell --lang=en create master ./tmp <.spell-dict
-echo "Checking spelling...\n"
+echo "Checking spelling..."
 
 let "fails=0"
 
-for file in $(find build/docs/ -type f -name "*.html"); do
+for file in $(find site/ -type f -name "*.html"); do
     words=$(aspell list --lang=en --mode=html --add-html-skip=code --extra-dicts=./tmp  <$file)
     if [ "$words" ]; then
         uniquewords=$(tr ' ' '\n' <<< "${words[@]}" | sort -u | tr '\n' ' ')
@@ -22,7 +22,7 @@ for file in $(find build/docs/ -type f -name "*.html"); do
     fi
 done
 rm -f ./tmp
-rm -rf build
+rm -rf site
 
 if [ $fails -gt 0 ]; then
     echo "$fails files with misspelled words."