Replace the browser markdown renderer with a filter

The readme is now escaped plain text unless `about-filter` points at
the new `about-render.lua`, which renders markdown, man pages and plain
text server-side. `enable-markdown` goes away with the renderer.

1 file changed, 592 insertions, 0 deletions

diff --git a/extensions/about-render.lua b/extensions/about-render.lua
new file mode 100644
index 0000000..073b531
--- /dev/null
+++ b/extensions/about-render.lua
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