feat!: make all cards except speak in moloashi optional

src/templates/molaoshi/.template-spec.yaml

src/templates/molaoshi/hear/back.html

src/templates/molaoshi/hear/front.html

src/templates/molaoshi/identify_radical/back.html

...templates/molaoshi/identify_radical_traditional/back.html

src/templates/molaoshi/read_hanzi/back.html

src/templates/molaoshi/read_hanzi/front.html

src/templates/molaoshi/read_hanzi_traditional/back.html

src/templates/molaoshi/read_pinyin/back.html

src/templates/molaoshi/read_pinyin/front.html

src/templates/molaoshi/speak/back.html

src/templates/molaoshi/write/back.html

src/templates/molaoshi/write_traditional/back.html