Strip qr code from gmail plain and html

__tests__/files/gmail-gmail/one/21/r_htmlContent.html

__tests__/files/gmail-gmail/one/21/s_htmlContent.html

__tests__/files/gmail-gmail/one/22/r_htmlContent.html

__tests__/files/gmail-gmail/one/22/s_htmlContent.html

__tests__/html-gmail-gmail.test.ts

__tests__/htmltext-gmail-gmail.test.ts

__tests__/htmltext-gmail-outlook.test.ts

__tests__/htmltext-outlook-outlook.test.ts

__tests__/utils.ts

src/HTMLNormalizer/strategies/gmail.ts

src/HTMLNormalizer/strategies/outlook.ts

src/PlainNormalizer/PlainNormalizer.ts