docs: Update broken fireslime references (#2324)

I am on a crusade to improve our spellchecking. I have a big PR that I am now going to break down into very small chunks to for review.

This is another hopefully not controversial one - broken links referencing the old Fire Slime.
Updating the links means we no longer need that word in our dictionary file.

.github/.cspell/flame_dictionary.txt

@@ -4,7 +4,6 @@ Audioplayers
 BGUG
 Bodymovin
 Dashbook
-Fireslime
 Hermione
 Kawabunga
 Klingsbo

packages/flame_flare/README.md

@@ -68,7 +68,7 @@ See the example app for a slightly more complex usage.
 The simplest way to show us your support is by giving the project a star.
 
 You can also support us by becoming a patron on Patreon:
-[![Patreon](https://c5.patreon.com/external/logo/become_a_patron_button.png)](https://www.patreon.com/fireslime)
+[![Patreon](https://c5.patreon.com/external/logo/become_a_patron_button.png)](https://www.patreon.com/bluefireoss)
 
 Or by making a single donation by buying us a coffee:
-[![Buy Me A Coffee](https://user-images.githubusercontent.com/835641/60540201-fcd7fa00-9ce4-11e9-87ec-1e98568e9f58.png)](https://www.buymeacoffee.com/fireslime)
+[![Buy Me A Coffee](https://user-images.githubusercontent.com/835641/60540201-fcd7fa00-9ce4-11e9-87ec-1e98568e9f58.png)](https://www.buymeacoffee.com/bluefire)