doc config tweak

[jyoung4242]

Tweaking the docusaurus configuration file, adding

blog: {
          showReadingTime: true,
          // Please change this to your repo.
          // Remove this to remove the "edit this page" links.
          editUrl: 'https://github.com/excaliburjs/Excalibur/tree/main/site/blog/',
          rehypePlugins: [[rehypeRaw, rehypeRawOptions]],
          postsPerPage: 'ALL',     //-----------------------------------------new
          blogSidebarTitle: 'All posts',//-----------------------------------------new
          blogSidebarCount: 'ALL',//-----------------------------------------new
          
        },

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