add hero theme as submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "themes/hugo-hero-theme"]
+	path = themes/hugo-hero-theme
+	url = git@github.com:seuh2022/hugo-hero-theme.git

README.MD

@@ -0,0 +1,13 @@
+# About the SEUH 2022 Website
+
+
+
+## Theme
+
+The SEUH 2022 Website is based on the
+[Hero Hugo Theme](https://themes.gohugo.io/themes/hugo-hero-theme/), on GitHub:
+[zerostaticthemes/hugo-hero-theme: A multi-page Hugo theme with fullscreen hero images and fullwidth sections.](https://github.com/zerostaticthemes/hugo-hero-theme)
+
+Based on a fork in [seuh2022/hugo-hero-theme](https://github.com/seuh2022/hugo-hero-theme), after
+reading this article:
+[Using git submodule for Hugo themes - Don't Panic](https://www.andrewhoog.com/post/git-submodule-for-hugo-themes/)

config.toml

@@ -1,7 +1,7 @@
 baseURL = "www.example.com"
 languageCode = "en-us"
 title = "Hugo Hero Theme"
-themesDir = "../.."
+# themesDir = "../.."
 theme = "hugo-hero-theme"
 
 [module]

themes/hugo-hero-theme

@@ -0,0 +1 @@
+Subproject commit 8c7e75f28503d4253f32564a61939a7d36e1a792