Add Google Keep converter

[vantezzen]

Hello,

StandardNotes currently offers a Evernote and Plaintext to StandardNotes converter on its tools page. This is why I request adding a Google Keep to StandardNotes converter to this page as well to make switching to StandardNotes as easy as possible for everyone. I hope this is the right repository to do so.

I am currently maintaining a standalone Google Keep to StandardNotes converter outside of StandardNotes, but I wouldn't want people to rely on a unknown, untrusted third-party to convert possibly confidential notes.

This PR will merge my Google Keep to StandardNotes converter into the StandardNotes tools page. When adding the converter to the final page, I suggest adding a tutorial like this:

1. Please visit https://takeout.Google.com/settings/takeout and download the archive for Google Keep™.
2. Extract your Google Takeout™ locally, then select the contents of the "Keep" folder

This converter currently only converts raw text, not converting any HTML styling as styling is not supported in the free StandardNotes editor though keeping HTML styles should be easily possible by replacing contentElement.innerText.replace(/☐\n/g, '☐').replace(/☑\n/g, '☑'); in lib/sntools.js, line 191 with contentElement.innerHTML.

[moughxyz]

Hey @vantezzen, thanks for this! In order for this to actually be used, I'll need to update the website code as well where the conversion happens (dashboard.standardnotes.org/tools) to add a Google Keep section. I'll need at least a week before I can get to this, but it could be longer. But I'll keep this thread unread in my inbox until I can get to it. Thanks again 🙏

[moughxyz]

Live here: https://standardnotes.org/help/35/how-can-i-import-my-notes-from-google-keep and here: https://dashboard.standardnotes.org/tools

Thanks!