Revert the "standardize author data"

There were some breaking changes etc. that is too late to fix for 0.17.

Let us think this through and add proper author support for Hugo 0.18.

Fixes #2464

Revert "docs: Add documentation for author profiles"

This reverts commit b6673e5309.

Revert "Add First Class Author Support"

This reverts commit cf978c0649.

hugolib/site.go

@@ -165,7 +165,7 @@ type SiteInfo struct {
 
 	BaseURL               template.URL
 	Taxonomies            TaxonomyList
-	Authors               Authors
+	Authors               AuthorList
 	Social                SiteSocial
 	Sections              Taxonomy
 	Pages                 *Pages // Includes only pages in this language
@@ -176,6 +176,7 @@ type SiteInfo struct {
 	Hugo                  *HugoInfo
 	Title                 string
 	RSSLink               string
+	Author                map[string]interface{}
 	LanguageCode          string
 	DisqusShortname       string
 	GoogleAnalytics       string
@@ -732,11 +733,6 @@ func (s *Site) readDataFromSourceFS() error {
 	}
 
 	err = s.loadData(dataSources)
-
-	// extract author data from /data/_authors then delete it from .Data
-	s.Info.Authors = mapToAuthors(cast.ToStringMap(s.Data["_authors"]))
-	delete(s.Data, "_authors")
-
 	s.timerStep("load data")
 	return err
 }
@@ -912,6 +908,7 @@ func (s *Site) initializeSiteInfo() {
 	s.Info = SiteInfo{
 		BaseURL:                        template.URL(helpers.SanitizeURLKeepTrailingSlash(viper.GetString("BaseURL"))),
 		Title:                          lang.GetString("Title"),
+		Author:                         lang.GetStringMap("author"),
 		Social:                         lang.GetStringMapString("social"),
 		LanguageCode:                   lang.GetString("languagecode"),
 		Copyright:                      lang.GetString("copyright"),