Docs Clean

[boundless-forest]

This PR reconstructs the document in this repo, many of them are out of date. Some of the utils, examples are created at least 3 years ago and untouched afterwards, seems unnecessary today. Also, the frontier tempate node release is already archived, I think there is no need to keep this. Make the document layout much clearer, then we can consider adding more in the future. @sorpaas

[boundless-forest]

@koushiro @sorpaas Please review this again.

[koushiro]

Please unify the doc format, such as the length of each line in the markdown
revert the changes or using new style
maybe check them with editorconfig?

[boundless-forest]

Please unify the doc format, such as the length of each line in the markdown

Do you have a recommended way to limit the line length in the markdown? I have tried the editorconfig, it doesn't have this option yet. I don't think it's a good idea to use some personal plugin, extensions that are not friendly to different development enviroment.

[koushiro]

I mean using editorconfig CI to check the max line length editorconfig/editorconfig#387
If you think it's not a good idea, then at least manually maintain a consistent formatting style in this PR

[cdxker]

Cheers. Thanks for this pr!