docs: remove changelog documentation (#2540)

#### What type of PR is this?

/kind documentation

#### What this PR does / why we need it:

目前 Halo 处于多版本同时并存发行的现状,所以在各个分支(main、release-1.5、release-1.6)维护 CHANGELOG.md 会变得比较麻烦。所以考虑移除掉仓库内的 CHANGELOG.md 文件,后续以 [releases](https://github.com/halo-dev/halo/releases) 页面提供。

Ref https://github.com/halo-dev/halo/issues/2538

#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/2538

#### Special notes for your reviewer:

/cc @halo-dev/sig-halo 

#### Does this PR introduce a user-facing change?

```release-note
None
```
pull/2546/head v2.0.0-alpha.2
Ryan Wang 2022-10-12 16:20:15 +08:00 committed by GitHub
parent cc221d31c7
commit 823acdaaae
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