chore: cleanup the http example (#1369)

* Fixed the http example

* Removed local paths from Gemfile
* Added puma to Gemfile
  Sinatra requires a web server to handle requests, installing puma is recommended on their
  documentation.

* Update README.md

* puma instead of thin

Author: Shaul Shnaidman

examples/http/Gemfile

@@ -3,7 +3,8 @@
 source "https://rubygems.org"
 
 gem "faraday", "~> 0.16.1"
-gem "opentelemetry-api", path: "../../api"
-gem "opentelemetry-common", path: "../../common"
-gem "opentelemetry-sdk", path: "../../sdk"
+gem "opentelemetry-api"
+gem "opentelemetry-common"
+gem "opentelemetry-sdk"
 gem "sinatra", "~> 2.0"
+gem "puma"

examples/http/README.md

@@ -10,11 +10,20 @@ This is a simple example that demonstrates tracing an HTTP request from client t
 
 ### Running the example
 
-1. Install gems
-  * `bundle install`
-1. Start the server from the `examples/http` directory
-	* `./server.rb`
-1. In a separate terminal window, run the client to make a single request:
-	* `./client.rb`
-1. You should see console exporter output for both the client and server sessions.
+Install gems
+```sh
+bundle install
+```
+
+Start the server
+```sh
+ruby server.rb
+```
+
+In a separate terminal window, run the client to make a single request:
+```sh
+ruby client.rb
+```
+
+You should see console exporter output for both the client and server sessions.