docs: non-checkpoint-branch workflow

[Jinjiang]

An update to follow this workflow demo:
https://github.com/Jinjiang/translation-workflow-demo

This is considered an alternative approach to #1824

Changes:

1. Included the changes in Add translation status on page top #1824
2. Added a new npm script to generate a file named translation-status.json to record translation checkpoints. This script should be run when each time we sync up translations for any language.
3. Simplified the workflow by removing the maintenance of checkpoint branches.

Thanks.

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[Jinjiang]

@posva This is ready for review. Thanks.

[posva]

@Jinjiang Thanks! Really sorry for the delay, I will give it a look in 1-2 weeks

[nazarepiedady]

@Jinjiang I really liked the idea, I hope it goes ahead.

[posva]

Thanks a lot @Jinjiang and sorry again for the delay 🙏

[posva]

There are a few issues with this section:

• no introductory sentence. It's as if the 1st point was that but I think it's missing something along the lines of Keeping translations updated
• inconsistent spacing (3 and 4, should be 2 spaces)
• The sample URL should be a real example so users can actually replace things in that URL to test it out

[Jinjiang]

@posva for spacing, I found 2 spaces in front of ordered list won't be recognized as indents in the Markdown preview. So I kept 4 spaces instead. The 3 spaces was a mistake, sorry about that (however they can also be recognized as indents).

For the rest part I modified a little accordingly. Please take a further look. Thanks.

[posva]

I think it's better to explicitly add the steps 4 and 5 with adapted commands

[Jinjiang]

@posva hey, do you think we can merge this or there is anything further to improve? :-)

[Jinjiang]

@nazarepiedady now this workflow has been officially confirmed. feel free to translate the vue router docs in this way. 😉

I will also write something about this in the vuejs-translations org later.

Thanks.

[nazarepiedady]

@Jinjiang, I will start making the necessary changes to organize the work I am doing over the Portuguese translation to match the current conclusions about how the translation workflow should be.