Several merge-backs

[liushuyu]

This change is 

[LionNatsu]

Is it possible to split controllers/mirrors.json to repo web-content?

[MingcongBai]

@liushuyu

[LionNatsu]

I am not very clear about the testing system and the new mirror status monitor... Please feel free to merge when you think it is ready to merge.

BTW, @liushuyu, it maybe too long to be an issue... I will suggest that you may separate them into several branch by their functionalities next time.

(It says: "Pull requests that have a failing status can’t be merged on a phone." 🤣)

[liushuyu]

I am not very clear about the testing system and the new mirror status monitor... Please feel free to merge when you think it is ready to merge.

I was thinking it was a false-positive, but now I saw the links in RSS feed are all https://aosc.io/undefined. I'll get to fix this.

So, see, this is the use of testing system, although my tests are not very good, but still be able to figure out some problems

[coveralls]

Changes Unknown when pulling e04147b on liushuyu:develop into on AOSC-Dev:develop.

[coveralls]

Changes Unknown when pulling 0be707d on liushuyu:develop into ** on AOSC-Dev:develop**.

[liushuyu]

Tests are passed despite the code check (need some kind of refactor to resolve the remaining problems), will merge this in 4 hours if there's no objections.

[liushuyu]

will merge this in 4 minutes if there's no objections.

[coveralls]

Changes Unknown when pulling e40d999 on liushuyu:develop into ** on AOSC-Dev:develop**.

[Yexiaoxing]

2 checks failed?

[liushuyu]

2 checks failed?

Only one now, it's the code style issue, can't be fixed unless a refactor is done.

[coveralls]

Changes Unknown when pulling e40d999 on liushuyu:develop into ** on AOSC-Dev:develop**.

[liushuyu]

Merged #80

[LionNatsu]

LGTM