chore: fix broken links and help text (#4043)

* chore: fix broken links
* chore: fix link
* chore: remove redundant link from readme
* chore: remode dead link from readme

README.md

@@ -30,9 +30,8 @@ We've come a long way, but this project is still in Alpha, lots of development i
 * Ensure CORS is [correctly configured](https://github.com/ipfs/js-ipfs/blob/master/docs/CORS.md) for use with the HTTP client
 * Look into the [examples](https://github.com/ipfs-examples/js-ipfs-examples/tree/master) to learn how to spawn an IPFS node in Node.js and in the Browser
 * Consult the [Core API docs](https://github.com/ipfs/js-ipfs/tree/master/docs/core-api) to see what you can do with an IPFS node
-* Visit https://dweb-primer.ipfs.io to learn about IPFS and the concepts that underpin it
-* Head over to https://proto.school to take interactive tutorials that cover core IPFS APIs
-* Check out https://docs.ipfs.io for tips, how-tos and more
+* Head over to https://proto.school to take the [IPFS course](https://proto.school/course/ipfs) that covers core IPFS concepts and JS APIs
+* Check out https://docs.ipfs.io for [glossary](https://docs.ipfs.io/concepts/glossary), tips, how-tos and more
 * See https://blog.ipfs.io for news and more
 * Need help? Please ask 'How do I?' questions on https://discuss.ipfs.io
 
@@ -113,10 +112,9 @@ This project is broken into several modules, their purposes are:
 * [`/packages/ipfs-grpc-protocol`](./packages/ipfs-grpc-protocol) Shared module between the gRPC client and server
 * [`/packages/ipfs-grpc-server`](./packages/ipfs-grpc-server) A gRPC-over-websockets server for js-IPFS
 * [`/packages/ipfs-http-client`](./packages/ipfs-http-client) A client for the RPC-over-HTTP API presented by both js-ipfs and go-ipfs
+* [`/packages/ipfs-http-server`](./packages/ipfs-http-server) JS implementation of the [IPFS RPC HTTP API](https://docs.ipfs.io/reference/http/api/)
 * [`/packages/ipfs-http-gateway`](./packages/ipfs-http-gateway) JS implementation of the [IPFS HTTP Gateway](https://docs.ipfs.io/concepts/ipfs-gateway/)
 * [`/packages/ipfs-http-response`](./packages/ipfs-http-response) Creates a HTTP response for a given IPFS Path
-* [`/packages/ipfs-http-server`](./packages/ipfs-http-server) JS implementation of the [IPFS HTTP API](https://docs.ipfs.io/reference/http/api/)
-* [`/packages/ipfs-message-port-client`](./packages/ipfs-http-client) A client for the RPC-over-HTTP API presented by both js-ipfs and go-ipfs
 * [`/packages/ipfs-message-port-client`](./packages/ipfs-message-port-client) A client for the RPC-over-message-port API presented by js-ipfs running in a shared worker
 * [`/packages/ipfs-message-port-protocol`](./packages/ipfs-message-port-protocol) Code shared by the message port client & server
 * [`/packages/ipfs-message-port-server`](./packages/ipfs-message-port-server) The server that receives requests from ipfs-message-port-client

docs/BROWSERS.md

@@ -54,8 +54,8 @@ You can find detailed information about running js-ipfs [here](https://github.co
   The default ones are under high load and should be used only for tests and development.
 - Make sure content added to js-ipfs running in the browser is persisted/cached somewhere on regular IPFS daemon
   - Manually `pin` or preload CIDs of interest with `refs -r` beforehand.
-  - Preload content on the fly using [preload](https://github.com/ipfs/js-ipfs/blob/master/packages/ipfs/docs/MODULE.md#optionspreload) feature and/or
-    configure [delegated routing](https://github.com/ipfs/js-ipfs/blob/master/packages/ipfs/docs/DELEGATE_ROUTERS.md).
+  - Preload content on the fly using [preload](https://github.com/ipfs/js-ipfs/blob/master/docs/MODULE.md#optionspreload) feature and/or
+    configure [delegated routing](https://github.com/ipfs/js-ipfs/blob/master/docs/DELEGATE_ROUTERS.md).
     - Avoid public instances in production environment. Make sure preload and delegate nodes used in config are self-hosted and under your control (expose a subset of go-ipfs APIs via reverse proxy such as Nginx).
 
 ## Code Examples

docs/DELEGATE_ROUTERS.md

@@ -24,7 +24,7 @@ Available delegate multiaddrs are:
 
 **Note**: If more than 1 delegate multiaddr is specified, the actual delegate will be randomly selected on startup.
 
-**Note**: If you wish to use delegated routing and are creating your node _programmatically_ in Node.js or the browser you must `npm install libp2p-delegated-content-routing` and/or `npm install libp2p-delegated-peer-routing` and provide configured instances of them in [`options.libp2p`](#optionslibp2p). See the module repos for further instructions:
+**Note**: If you wish to use delegated routing and are creating your node _programmatically_ in Node.js or the browser you must `npm install libp2p-delegated-content-routing` and/or `npm install libp2p-delegated-peer-routing` and provide configured instances of them in [`options.libp2p`](./MODULE.md#optionslibp2p). See the module repos for further instructions:
 
 - https://github.com/libp2p/js-libp2p-delegated-content-routing
 - https://github.com/libp2p/js-libp2p-delegated-peer-routing