EveryVoice

e19a39d6 - feat(demo): adds an option of language and speaker choice in demo

feat(demo): adds an option of language and speaker choice in demo In demo, adds two elements with dropdown lists of languages and speakers a model was traind on. Removes the requirement to specify language and speaker running the command everyvoice demo ... Fixes https://github.com/roedoejet/EveryVoice/issues/448