feat: Add link to GitHub sponsors button

Closes #141

index.html

@@ -297,6 +297,7 @@
     <p data-i18n="[html]textbox.support"></p>
     <p data-i18n="textbox.contributors-text"></p>
     <p id="contributors"><span data-i18n="textbox.contributors"></span>: </p>
+    <p data-i18n="[html]textbox.sponsor"></p>
     <div class="dialog-box-lng">
       <p data-i18n="textbox.language"></p>: <select id="language"></select>
     </div>

locales/en.json

@@ -73,6 +73,7 @@
     "development": "This app is still in development, but will improve over time!",
     "thanks": "None of this would have been possible without <a href=\"https://twitter.com/_Ninji/status/1244818665851289602?s=20\">Ninji's work</a> figuring out just how Timmy and Tommy value their turnips.",
     "support": "Support, comments and contributions are available through <a href=\"https://github.com/mikebryant/ac-nh-turnip-prices/issues\">Github</a>",
+    "sponsor": "Want to sponsor the developers behind this project? Go to the <a href=\"https://github.com/mikebryant/ac-nh-turnip-prices#sponsor-button-repo\">GitHub</a> page and click '❤ Sponsor'",
     "contributors-text": "Oh! And let's not forget to thank those who have contributed so far!",
     "contributors": "Contributors",
     "language": "Language"