Fix typos and cleanup the bundle & improve README

[williamdes]

You can see useless stuff on the distributed bundle: https://cdn.jsdelivr.net/npm/@srexi/purecounterjs/

Before

williamdes@williamdes:/mnt/Dev/@williamdes/purecounterjs$ npm publish --dry-run
npm notice 
npm notice 📦  @srexi/purecounterjs@1.1.4
npm notice === Tarball Contents === 
npm notice 1.1kB LICENSE                              
npm notice 4.4kB README.md                            
npm notice 2.5kB .github/workflows/codeql-analysis.yml
npm notice 8.0kB asset/browserstack-logo-600x315.png  
npm notice 3.6kB dist/purecounter_vanilla.js          
npm notice 4.8kB dist/purecounter.js                  
npm notice 2.2kB index.html                           
npm notice 9.1kB js/purecounter_vanilla.js            
npm notice 8.8kB js/purecounter.js                    
npm notice 1.4kB package.json                         
npm notice 74B   purecounter.js                       
npm notice 115B  webpack.mix.js                       
npm notice === Tarball Details === 
npm notice name:          @srexi/purecounterjs                    
npm notice version:       1.1.4                                   
npm notice filename:      @srexi/purecounterjs-1.1.4.tgz          
npm notice package size:  19.6 kB                                 
npm notice unpacked size: 46.1 kB                                 
npm notice shasum:        aa020ee0fdd1f15bf37b784778f476680cd2b133
npm notice integrity:     sha512-z4HKwnazKqXLJ[...]YVQ7t0kNmT+Ew==
npm notice total files:   12                                      
npm notice 
+ @srexi/purecounterjs@1.1.4

After

williamdes@williamdes:/mnt/Dev/@williamdes/purecounterjs$ npm publish --dry-run
npm notice 
npm notice 📦  @srexi/purecounterjs@1.1.4
npm notice === Tarball Contents === 
npm notice 1.1kB LICENSE                    
npm notice 4.4kB README.md                  
npm notice 3.6kB dist/purecounter_vanilla.js
npm notice 4.8kB dist/purecounter.js        
npm notice 9.1kB js/purecounter_vanilla.js  
npm notice 8.8kB js/purecounter.js          
npm notice 1.4kB package.json               
npm notice 74B   purecounter.js             
npm notice === Tarball Details === 
npm notice name:          @srexi/purecounterjs                    
npm notice version:       1.1.4                                   
npm notice filename:      @srexi/purecounterjs-1.1.4.tgz          
npm notice package size:  9.0 kB                                  
npm notice unpacked size: 33.3 kB                                 
npm notice shasum:        0c1a7e9c0d707c95dcfc900b8bd9a7eb3e708ab6
npm notice integrity:     sha512-wH85pWVfDZjGM[...]mhnp2Y0p+gTmA==
npm notice total files:   8                                       
npm notice 
+ @srexi/purecounterjs@1.1.4

[srexi]

Amazing well spotted and thank you very much!