Update instructions for creating gh-pages branch
Adding extra icons (ga & snapshot) to download & docs widgets
Removing zip option from download widget

[Finished #55963742]
Merge branch 'gh-pages' of https://github.com/spring-projects/gh-pages into gh-pages
reposition maven|gradle switcher [#56070698]
Merge branch 'gh-pages' of https://github.com/spring-projects/gh-pages into gh-pages
Fix Dependencies, Breadcrumbs