Fix missing lexicon content in mobile app

[danbenn]

Why

• Previously, dictionary definitions were parsed into JSON objects
• However, there were some errors with the parsing, causing some definitions to have missing content

Solution

• Instead of fixing this structure, instead, the mobile app will display the raw HTML, so that the formatting is as similar to the web version as possible
• Since firing up a true webview is slow, they will be parsed into native React native elements using this library, via separate PR: https://github.com/meliorence/react-native-render-html