doc: remove symbolic link for readme

README.md

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+# deno-slack-api
+
+[![codecov](https://codecov.io/gh/slackapi/deno-slack-api/graph/badge.svg?token=QKJCI23P5S)](https://codecov.io/gh/slackapi/deno-slack-api)
+
+Slack API Client for Deno Run on Slack projects
+
+```ts
+import { SlackAPI } from "jsr:@slack/api";
+
+const client = SlackAPI(token);
+
+// ...or create a client with options
+const client = SlackAPI(token, {
+  slackApiUrl: "...",
+});
+
+await client.chat.postMessage({
+  text: "hello there",
+  channel: "...",
+});
+
+// respond to a response_url
+await client.response("...", payload);
+
+// use apiCall() w/ method name
+await client.apiCall("chat.postMessage", {
+  text: "hello there",
+  channel: "...",
+});
+```
+
+## Requirements
+
+A recent version of `deno`.
+
+## Versioning
+
+Releases for this repository follow the [SemVer](https://semver.org/) versioning
+scheme. The SDK's contract is determined by the top-level exports from
+`src/mod.ts` and `src/types.ts`. Exports not included in these files are deemed
+internal and any modifications will not be treated as breaking changes. As such,
+internal exports should be treated as unstable and used at your own risk.
+
+## Running Tests
+
+If you make changes to this repo, or just want to make sure things are working
+as desired, you can run:
+
+    deno task test
+
+To get a full test coverage report, run:
+
+    deno task test:coverage
+
+---
+
+### Getting Help
+
+We welcome contributions from everyone! Please check out our
+[Contributor's Guide](https://github.com/slackapi/deno-slack-api/blob/main/.github/CONTRIBUTING.md)
+for how to contribute in a helpful and collaborative way.