v3.1.0

[LogCreative]

• 更新 Overleaf 链接docs: overleaf link #141
• 添加 make install ci: make install #145
• 修复 min 主题标题页头图为空的判定问题 fix: if titlegraphic empty #156
• 升级 workflow 依赖版本 ci: upgrade action version #157
• 更新 demo docs: update demo #158
  docs: demo minor update #160
• 修正海报 poster 插件多行标题问题 fix: poster headline and footer #169

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This discussion was created from the release Release v3.1.0.