chore(pack): reduce bundled files published

[PixnBits]

reduces size on disk from 2MB to <400kB, potential audit false-positive surface area

current:

$ npm pack
npm notice 
npm notice 📦  [email protected]
npm notice === Tarball Contents === 
npm notice 216B    .editorconfig                  
npm notice 1.3kB   LICENSE                        
npm notice 162.7kB src/media/reset.ai             
npm notice 4.4kB   tests/assets/qunit.css         
npm notice 1.3kB   demo/custom-controls.html      
npm notice 3.2kB   demo/custom-event-handlers.html
npm notice 2.1kB   demo/dynamic-load.html         
npm notice 605B    demo/embed.html                
npm notice 668B    demo/img.html                  
npm notice 1.0kB   index.html                     
npm notice 2.2kB   tests/index.html               
npm notice 73.7kB  demo/inline-viewbox-zoomed.html
npm notice 73.7kB  demo/inline-wide.html          
npm notice 74.3kB  demo/inline.html               
npm notice 1.9kB   demo/layers.html               
npm notice 2.4kB   demo/limit-pan.html            
npm notice 3.6kB   demo/mobile.html               
npm notice 349.1kB demo/multi-instance.html       
npm notice 648B    demo/object.html               
npm notice 433B    demo/require.html              
npm notice 1.3kB   demo/resize.html               
npm notice 2.5kB   demo/simple-animation.html     
npm notice 1.6kB   demo/sinchronized.html         
npm notice 1.9kB   demo/thumbnailViewer.html      
npm notice 31.0kB  demo/wikipathways.html         
npm notice 190.3kB tests/assets/blanket.js        
npm notice 77B     src/browserify.js              
npm notice 9.5kB   src/control-icons.js           
npm notice 2.2kB   gulpfile.js                    
npm notice 67.6kB  demo/hammer.js                 
npm notice 95.9kB  demo/jquery.min.js             
npm notice 95.8kB  tests/assets/jquery.min.js     
npm notice 63.2kB  tests/assets/qunit.js          
npm notice 221B    demo/require-main.js           
npm notice 6.5kB   server.js                      
npm notice 9.0kB   src/shadow-viewport.js         
npm notice 507B    src/stand-alone.js             
npm notice 65.6kB  dist/svg-pan-zoom.js           
npm notice 26.0kB  src/svg-pan-zoom.js            
npm notice 29.8kB  dist/svg-pan-zoom.min.js       
npm notice 7.5kB   src/svg-utilities.js           
npm notice 15.3kB  tests/test_api.js              
npm notice 7.0kB   demo/thumbnailViewer.js        
npm notice 3.9kB   src/uniwheel.js                
npm notice 8.2kB   src/utilities.js               
npm notice 49B     .eslintrc.json                 
npm notice 2.4kB   package.json                   
npm notice 403B    tsconfig.json                  
npm notice 134B    tslint.json                    
npm notice 1.5kB   ISSUE_TEMPLATE.md              
npm notice 22.0kB  README.md                      
npm notice 25.8kB  svg-pan-zoom-logo.png          
npm notice 33.0kB  demo/pathway.svg               
npm notice 2.7kB   src/media/reset.svg            
npm notice 10.4kB  svg-pan-zoom-logo.svg          
npm notice 68.7kB  demo/tiger.svg                 
npm notice 68.7kB  tests/assets/tiger.svg         
npm notice 224.2kB demo/Tux.svg                   
npm notice 6.6kB   dist/svg-pan-zoom.d.ts         
npm notice 3.0kB   tests/test_typescript.ts       
npm notice === Tarball Details === 
npm notice name:          svg-pan-zoom                            
npm notice version:       3.6.1                                   
npm notice filename:      svg-pan-zoom-3.6.1.tgz                  
npm notice package size:  681.3 kB                                
npm notice unpacked size: 2.0 MB                                  
npm notice shasum:        1132bab2cafdc2954d61098c9816c56506a983f6
npm notice integrity:     sha512-Q/TeYEib+S3w9[...]j2+V6XJS8nBXA==
npm notice total files:   60                                      
npm notice 
svg-pan-zoom-3.6.1.tgz

after this diff:

$ npm pack
npm notice 
npm notice 📦  [email protected]
npm notice === Tarball Contents === 
npm notice 1.3kB   LICENSE                 
npm notice 162.7kB src/media/reset.ai      
npm notice 77B     src/browserify.js       
npm notice 9.5kB   src/control-icons.js    
npm notice 9.0kB   src/shadow-viewport.js  
npm notice 507B    src/stand-alone.js      
npm notice 65.6kB  dist/svg-pan-zoom.js    
npm notice 26.0kB  src/svg-pan-zoom.js     
npm notice 29.8kB  dist/svg-pan-zoom.min.js
npm notice 7.5kB   src/svg-utilities.js    
npm notice 3.9kB   src/uniwheel.js         
npm notice 8.2kB   src/utilities.js        
npm notice 2.4kB   package.json            
npm notice 22.0kB  README.md               
npm notice 2.7kB   src/media/reset.svg     
npm notice 6.6kB   dist/svg-pan-zoom.d.ts  
npm notice === Tarball Details === 
npm notice name:          svg-pan-zoom                            
npm notice version:       3.6.1                                   
npm notice filename:      svg-pan-zoom-3.6.1.tgz                  
npm notice package size:  173.2 kB                                
npm notice unpacked size: 357.7 kB                                
npm notice shasum:        bfedfea0e935170bb3f254a9aae6fbbdabab48ac
npm notice integrity:     sha512-bjdZlGhKiBdD9[...]SIPm5gyhtMxmg==
npm notice total files:   16                                      
npm notice 
svg-pan-zoom-3.6.1.tgz

[PixnBits]

avoids including a tgz from a previous $ npm pack in another run, especially useful when actually publishing 😅