Add onyomi-hiragana handlebars

[rhgg2]

This pull request adds an onyomi-hiragana handlebars to the Anki card templates. It does exactly what it says.

I also found a typo in the documentation of the existing onyomi/kunyomi handlebars (hiragana and katakana are inverted).

I have made what I hope are all the necessary changes, except that I have not touched anything in the test directory.

[StefanVukovic99]

I think you need to npm run test:unit:write to update the tests with the new handlebar.

[Kuuuube]

You need to set the version from 35 to 36 in test/options-util.test.js in this area of the file:

        profileCurrent: 0,
        version: 35,
        global: {
            database: {
                prefixWildcardsSupported: false
            }
        }

[rhgg2]

Thanks for the feedback - I think everything should be in order now with the tests.