💚 Fix CI by removing theme returning 403 Forbidden error (#745)

```
11:20:47 PM: go: wangchucheng.com/hugo-eureka@v0.9.3: unrecognized
import path "wangchucheng.com/hugo-eureka": reading
https://wangchucheng.com/hugo-eureka?go-get=1: 403 Forbidden
```

Signed-off-by: Justin Wheeler <git@jwheel.org>

cmd/hugothemesitebuilder/build/cache/githubrepos.json

@@ -5254,14 +5254,5 @@
     "description": "",
     "html_url": "",
     "stargazers_count": 0
-  },
-  "wangchucheng.com/hugo-eureka": {
-    "id": 0,
-    "created_at": "0001-01-01T00:00:00Z",
-    "updated_at": "0001-01-01T00:00:00Z",
-    "name": "",
-    "description": "",
-    "html_url": "",
-    "stargazers_count": 0
   }
-}
+}

cmd/hugothemesitebuilder/build/config.json

@@ -3490,12 +3490,6 @@
         "noMounts": true,
         "path": "gitlab.com/writeonlyhugo/writeonlyhugo-theme"
       },
-      {
-        "ignoreConfig": true,
-        "ignoreImports": true,
-        "noMounts": true,
-        "path": "wangchucheng.com/hugo-eureka"
-      },
       {
         "ignoreConfig": true,
         "ignoreImports": true,
@@ -3516,4 +3510,4 @@
       }
     ]
   }
-}
+}

cmd/hugothemesitebuilder/build/go.mod

@@ -587,5 +587,4 @@ require (
 	gitlab.com/toryanderson/hugo-icarus v0.0.0-20200701121335-f3e99478c35b // indirect
 	gitlab.com/writeonlyhugo/writeonlyhugo-theme v0.0.0-20240502104725-cc4014d1c855 // indirect
 	go.ngs.io/hugo-primer-blog v1.0.8 // indirect
-	wangchucheng.com/hugo-eureka v0.9.3 // indirect
 )

themes.txt

@@ -579,7 +579,6 @@ gitlab.com/tmuguet/hugo-split-gallery
 gitlab.com/toryanderson/hugo-icarus
 gitlab.com/VincentTam/huginn
 gitlab.com/writeonlyhugo/writeonlyhugo-theme
-wangchucheng.com/hugo-eureka
 github.com/demius782/demius
 go.ngs.io/hugo-primer-blog
 github.com/Blunix-GmbH/hugo-theme-blunix