fix(style): images in posts are not center aligned
feat(grunt): add live reload support (BrowserSync)

BREAKING CHANGE: Now this project supports BrowserSync for page live reloading, script snippet is inserted after `<!-- BS_INSERT -->` in `top.html`
feat(grunt): rename all `server` task names to `serve`
chore(grunt): remove deprecated tasks
chore: bump version to 24.1.5