更新 README，将使用方式的说明优先级提高并完善。

/kind documentation

```release-note
None 
```

#### What type of PR is this?

/kind feature

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

为 `photos` 增加分页路由，并且支持 `group` 参数。如下

1. /photos
2. /photos?group={group}
3. /photos/page/{page}
4. /photos/page/{page}?group={group}

`photos` 路由下将新增 `photos` 参数，为携带分页参数的 [UrlContextListResult](https://github.com/halo-dev/halo/blob/bf2b92e77c35d70c85db4141a14702c188f1d45b/api/src/main/java/run/halo/app/theme/router/UrlContextListResult.java#L17) 类型

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

Fixes #9 

#### Special notes for your reviewer:


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

```release-note
增加分页路由并支持 group 参数
```

#### What type of PR is this?

/kind bug

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

Fixes #13 

#### Special notes for your reviewer:

修改一个分组名，成功修改并且没有创建新分组即可。

#### Does this PR introduce a user-facing change?
```release-note
解决修改分组名会导致新建分组的问题
```

#### What type of PR is this?

/kind bug

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

Fixes #12 

#### Special notes for your reviewer:

1. 点击一个需要修改的图片
2. 关闭弹出的修改框
3. 再次点击此图片，查看是否成功回显待修改的数据

#### Does this PR introduce a user-facing change?
```release-note
解决第二次点击编辑图片时不回显数据的问题
```

#### What type of PR is this?

/kind improvement

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

Fixes #10 

#### Special notes for your reviewer:

在主题端查看图片默认展示顺序是否为按创建时间倒序排序

#### Does this PR introduce a user-facing change?
```release-note
使图片默认排列方式变为按照创建时间倒序。
```

… for step (#18)

#### What type of PR is this?

/kind improvement

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

优化项目基础设施配置，并添加发布至 Halo 应用商店的 release job

#### Does this PR introduce a user-facing change?
```release-note
优化项目基础设施配置
```

#### What type of PR is this?

/kind feature

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

Fixes #14

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

添加模型元数据表单定义的支持。由于引入了 annotationsForm ，因此 Halo 版本依赖升级为 >=2.8.0

![image](https://github.com/halo-sigs/plugin-photos/assets/31335418/4b57adc0-21ec-49af-a849-442003a4849b)

![image](https://github.com/halo-sigs/plugin-photos/assets/31335418/efb5568a-39bf-4f34-9ce2-6e282fe89845)

#### Does this PR introduce a user-facing change?
```release-note
添加模型元数据表单定义的支持。
```

解决在新的分组，新增图片的报错问题。

```release-note
None
```