docs: Update README, update gifs to reflect new UI where applicable, and remove broken links

Author: Parkreiner

README.md

@@ -35,23 +35,19 @@ Swell is a one-stop shop for sending and monitoring your API requests:
 ## Supported Technologies
 
 - _HTTP2_: Swell supports full HTTP2 multiplexing of requests and responses. HTTP requests to the same host will be sent over the same connection. Swell will attempt to initiate an HTTP2 connection for all HTTPS requests by default, with the ability to revert to HTTP1.1 for legacy servers. Multiple concurrent streams are allowed for each connection.
-
-<img src="./ReadMeGifs/Gifs/ConcurrentStreams.gif" style="display: block; margin: 10px auto 30px; border: 1px solid black;" />
+  <img src="./ReadMeGifs/Gifs/HttpTesting.gif" style="display: block;  margin: 10px auto 30px; border: 1px solid black;" />
 
 - _Server-Sent Events (SSE)_: Initiated by a simple toggle box, Swell displays SSE events one by one as they come in. Similar to HTTP2 streams, multiple open connection streams are allowed for SSE.
-
   <img src="./ReadMeGifs/Gifs/SSE.gif" style="display: block; margin: 10px auto 30px;" />
 
 - _WebSockets (WS)_: Swell enables connecting directly to WebSocket servers with an HTTP handshake, with developers able to send messages to the connected WS server directly. All outgoing and incoming messages are displayed in real time.
-
-  <img src="./ReadMeGifs/Gifs/WS.gif" style="display: block; margin: 10px auto 30px;" />
+  <img src="./ReadMeGifs/Gifs/Websockets.gif" style="display: block; margin: 10px auto 30px;" />
 
 - _GraphQL_: Swell includes full support for all three root types of GraphQL - queries, mutations, and subscriptions – as well as Introspection. Variables are also supported, making creating queries easy.
-
   <img src="./ReadMeGifs/Gifs/GraphQL.gif" style="display: block; margin: 10px auto 30px;" />
 
 - _gRPC_: Swell includes full support for all four streaming types of gRPC - unary, client stream, server stream, bidirectional stream.
-  <img src="./ReadMeGifs/Gifs/GRPCResponses.gif" style="display: block; margin: 10px auto 30px;" />
+  <img src="./ReadMeGifs/Gifs/gRPC-responses.gif" style="display: block;  margin: 10px auto 30px;" />
 
 - _OpenAPI_: Swell supports the enumeration and execution of REST and RPC API requests as defined in a user-provided OpenAPI document.
   <img src="./ReadMeGifs/Gifs/openapi.gif" style="display: block; margin: 10px auto 30px;" />