Safely handle odd chars in filenames

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

content/olm-megolm/_index.md

@@ -4,9 +4,7 @@ weight: 61
 type: docs
 ---
 
-The Olm and Megolm cryptographic ratchets are not formally part
-of the Matrix specification. In lack of a better place, their
-specification is reproduced here, regardless.
+Matrix uses the Olm and Megolm cryptographic ratchets for [end-to-end encryption](../client-server-api/#end-to-end-encryption).
 
 -   [Olm: A Cryptographic Ratchet](/olm-megolm/olm/)
 -   [Megolm group ratchet](/olm-megolm/megolm/)

scripts/download-katex-assets.sh

@@ -1,8 +1,9 @@
 #!/bin/bash
-
+#
+# Download the KaTeX fonts and CSS, and copy them into `static`.
 set -e
 
-root=$(git rev-parse --show-toplevel)
+root=$(dirname "$0")/..
 
 # Check that the caller supplied a version.
 version=$1
@@ -35,6 +36,6 @@ install -vm644 "$tmp_dir/katex/katex.min.css" "$root/static/css/katex.min.css"
 
 # Remove any existing fonts and move the new ones into place.
 rm -rvf "$root"/static/css/fonts/KaTeX*
-while read -r file; do
+while IFS= read -r -d '' file; do
     install -vm644 "$file" "$root/static/css/fonts"
-done < <(find "$tmp_dir/katex/fonts" -maxdepth 1 -name "KaTeX*.woff2")
+done < <(find "$tmp_dir/katex/fonts" -maxdepth 1 -name "KaTeX*.woff2" -print0)