Migrating from Dokuwiki to markdown pages

I am in the process of migrating my old wiki from a Dokuwiki installation to a collection of markdown pages that I can maintain with git and some web tools (GitHub, ReadtheDocs, etc).

Steps for this are:

Use dokuwiki2git to export a git repository of the pages
Copy pages to new directory and change permissions of those pages

Convert dokuwiki to markdown using the pandoc mediawiki converter:

find . -name \*.txt -type f -exec pandoc -f mediawiki -t markdown -o {}.md {} \;

do some custom editing of the new markdown pages

for file in *.txt.md; do git mv "$file" "${file//txt./}"; done

replace nonbreaking spaces in vim
```
:%s/<NBSP>/ /g
```
where entering <NBSP> is accomplished with <CTRL-k>+space+space. OR - remove in all files with sed:
```
find . -type f -exec sed -i 's/\xC2\xA0/ /g' {} +
```

Replace other stuff with sed:

find . -type f -exec sed -i 's/ "wikilink"//g' {} +
find . -type f -exec sed -i 's/<\/code>/~~~/g' {} +
find . -type f -exec sed -i 's/<code bash>/~~~/g' {} + 
find . -type f -exec sed -i 's/-   -   / **/g' {} +

Change all links to the markdown convention of:
```
[linktext]({subdir/}markdownpage.md)
```
or, for relative links to pages in other subdirectories:
```
[linktext](/subdir/markdownpage.md)
```
Convert tables - a pain...