[#42] Add drag-and-drop reordering for exercises in workout and template

[brianwalborn]

This pull request adds drag-and-drop reordering for exercises in both the Home and Template Form views by integrating the vuedraggable library. It updates the package dependencies, enhances the user interface with drag handles, and refactors the relevant Vue templates to support interactive sorting.

Feature: Drag-and-drop exercise reordering

• Integrated the vuedraggable library and its dependency sortablejs into the project by updating package.json and package-lock.json. [1] [2] [3] [4]
• Refactored the exercise lists in HomeView.vue and TemplateFormView.vue to use the <draggable> component, enabling users to reorder exercises via drag-and-drop. [1] [2] [3] [4] [5]
• Added visual drag handles to each exercise item for improved usability and clear affordance of the drag-and-drop feature. [1] [2]

UI/UX improvements

• Adjusted spacing and layout in the exercise lists to accommodate the new drag-and-drop functionality and maintain visual consistency. [1] [2] [3]