Add back the acknowledgements readme, update about modal link (#818)

ACKNOWLEDGEMENTS.md

@@ -0,0 +1,5 @@
+# Open-Source Acknowledgements
+
+We make use of many amazing open-source projects to build Wave Terminal. We automatically generate license reports via FOSSA to comply with the license distribution requirements of our dependencies. Below is a summary of the licenses used by our product. For a full report, see [here](https://app.fossa.com/reports/24d13570-624b-4450-8c22-756e513060c9?full=true) (the page may take 20-30s to load).
+
+[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fwavetermdev%2Fwaveterm.svg?type=large)](https://app.fossa.com/projects/git%2Bgithub.com%2Fwavetermdev%2Fwaveterm?ref=badge_large)

frontend/app/modals/about.tsx

@@ -55,7 +55,7 @@ const AboutModal = ({}: AboutModalProps) => {
                     </LinkButton>
                     <LinkButton
                         className="secondary solid"
-                        href="https://github.com/wavetermdev/waveterm/blob/main/acknowledgements/README.md"
+                        href="https://github.com/wavetermdev/waveterm/blob/main/ACKNOWLEDGEMENTS.md"
                         target="_blank"
                         rel={"noopener"}
                         leftIcon={<i className="fa-sharp fa-light fa-heart"></i>}