Badges can be added in project page yaml

[#55621266]
Added simple template for easily creating twitter badges

[#55621266]
Reverted aggregator page to render projects in a grid of blocks
Update instructions for managing gh-pages
Fixed alignment on project aggregator [#55648828]
Polish margins on project page [#55731442]
made billboard height variable [#55278422]
Apply project badge icons [#55710298]
Generalize path to large project icon
Fix URLs on project badges
Improve layout of _config.yml
Improve instructions in README; improve sample home
Polish _config.yml
Rearrange badges
removed project-body--section container from #download-widget [#55731442]
Merge branch 'gh-pages' of github.com:spring-projects/gh-pages into gh-pages
Removed hover links, made entire project link [#55702616]
Fixed min-widths [#55914304]
Update instructions for creating gh-pages branch
Adding extra icons (ga & snapshot) to download & docs widgets