Feature Request: Import readme.md feature on website.

[CommunityWorkshop]

Is your feature request related to a problem? Please describe.
Whenever I want to edit my readme.md file, I open the website readme.so... the layout are set to default with no way to import the custom catagory. This means I have to manually go back and add the catagories which will take forever.... much better if I can just press a button and upload readme.md file and all of the catagories are automatically set.

Describe the solution you'd like
Have a system where you press a button and upload readme.md file and all of the catagories are automatically set.

Describe alternatives you've considered
There are two choises, you can either never delete cookies on the browser, or add all of the catagories manually. Never deleting cookies have privacy issues and adding catagories manually take forever to do.

Additional context
N/A

#264 (comment)

[SaadBazaz]

Needed! There should also be a way to import it directly via the link. E.g. navigating to
readme.so/editor?text=#%20this%20is%20sample%20text\nthis%20should%20work
should put that text in the editor by default.

[BrookJeynes]

@octokatherine taking a quick look through the code it seems this functionality is already half implemented within the local storage save and read function. I'm happy to add an import and export function to the homepage which exports and reads in the JSON formatting you already have setup?

[Danny-dK]

That would be very helpful to have an import feature. That would allow institutes to create their own templates, spread those templates to employees, which could then upload and work from that template. Hope that will possible soon.

[BrookJeynes]

@Danny-dK I'll look at creating this feature over the next couple days and will create a PR asap