Adopt gh:cN3rd/mdBook:rtl (rust-lang/mdBook#1641) for RTL support.

ivilata · ivilata · commit 63addeb755e9 · 2022-02-24T12:10:03.000+01:00
It fixes rendering issues with prev/next arrows, and it does not need altering
HTML after rendering.
diff --git a/user-manual/build.sh b/user-manual/build.sh
@@ -14,7 +14,8 @@ mdbook build
 #find "$outd" -name '*.html' | xargs sed -i '/<link href="[^"]*\bfonts\.googleapis\.com\b/d'
 
 # Fix output for RTL languages (needs <https://github.com/rust-lang/mdBook/pull/1489>).
-if grep -qE '^_direction\s*=\s*"?rtl?"' "$conf"; then
-    book="$(sed -nE 's/^build-dir\s*=\s"([^"]+)".*/\1/p' "$conf")"
-    find "$book" -name '*.html' -exec sed -i 's/<body /<body dir="rtl" /' '{}' ';'
-fi
+# No longer needed with <https://github.com/rust-lang/mdBook/pull/1641>.
+#if grep -qE '^_direction\s*=\s*"?rtl?"' "$conf"; then
+#    book="$(sed -nE 's/^build-dir\s*=\s"([^"]+)".*/\1/p' "$conf")"
+#    find "$book" -name '*.html' -exec sed -i 's/<body /<body dir="rtl" /' '{}' ';'
+#fi
diff --git a/user-manual/fa.toml b/user-manual/fa.toml
@@ -1,7 +1,7 @@
 [book]
 authors = ["Ivan Vilata-i-Balaguer", "Dmitri Vitaliev", "Jenny Ryan"]
 language = "fa"
-_direction = "rtl"
+text_direction = "rtl"
 multilingual = false
 src = "fa.src"
 title = "دفترچه‌ی راهنمای کاربر Censorship.no! (سنو)"
