Refactor web build process and update documentation

- Removed Node.js build artifacts from .gitignore and adjusted Makefile to reflect changes in web UI build process, now using server-rendered Go templates instead of React.
- Updated README to clarify the new web UI architecture and output formats, emphasizing the removal of the Node.js build step.
- Added a command to set the number of frames per render task in manager configuration, enhancing user control over rendering settings.
- Improved Gitea workflow by removing unnecessary npm install step, streamlining the CI process.

web/embed.go

@@ -4,42 +4,26 @@ import (
 	"embed"
 	"io/fs"
 	"net/http"
-	"strings"
 )
 
-//go:embed dist/*
-var distFS embed.FS
+//go:embed templates templates/partials static
+var uiFS embed.FS
 
-// GetFileSystem returns an http.FileSystem for the embedded web UI files
-func GetFileSystem() http.FileSystem {
-	subFS, err := fs.Sub(distFS, "dist")
+// GetStaticFileSystem returns an http.FileSystem for embedded UI assets.
+func GetStaticFileSystem() http.FileSystem {
+	subFS, err := fs.Sub(uiFS, "static")
 	if err != nil {
 		panic(err)
 	}
 	return http.FS(subFS)
 }
 
-// SPAHandler returns an http.Handler that serves the embedded SPA
-// It serves static files if they exist, otherwise falls back to index.html
-func SPAHandler() http.Handler {
-	fsys := GetFileSystem()
-	fileServer := http.FileServer(fsys)
-
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		path := r.URL.Path
-
-		// Try to open the file
-		f, err := fsys.Open(strings.TrimPrefix(path, "/"))
-		if err != nil {
-			// File doesn't exist, serve index.html for SPA routing
-			r.URL.Path = "/"
-			fileServer.ServeHTTP(w, r)
-			return
-		}
-		f.Close()
-
-		// File exists, serve it
-		fileServer.ServeHTTP(w, r)
-	})
+// StaticHandler serves /assets/* files from embedded static assets.
+func StaticHandler() http.Handler {
+	return http.StripPrefix("/assets/", http.FileServer(GetStaticFileSystem()))
 }
 
+// GetTemplateFS returns the embedded template filesystem.
+func GetTemplateFS() fs.FS {
+	return uiFS
+}