Improve the entire frontend

[reaper47]

• Make the entire frontend cleaner, more responsive, and aesthetically pleasing.
• Cut memory usage by half by removing the dependency on Boostport/mjml-go. During the profiling analysis of the heap, it was observed that the application retained an instance of the of wazero in memory. The package has been removed as it is undesirable. In its place, a build:mjml command was added to the package.json file.
• Replace make with task.