docs: remove outdated Black Playground references

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,9 +11,9 @@ Please make sure that the bug is not already fixed either in newer versions or t
 current development version. To confirm this, you have three options:
 
 1. Update Black's version if a newer release exists: `pip install -U black`
-2. Use the online formatter at <https://black.vercel.app/?version=main>, which will use
-   the latest main branch.
-3. Or run _Black_ on your machine:
+2. Install the latest `main` branch directly:
+   `pip install "black @ git+https://github.com/psf/black.git"`
+3. Or run _Black_ from source on your machine:
    - create a new virtualenv (make sure it's the same Python version);
    - clone this repository;
    - run `pip install -e .[d]`;

README.md

@@ -26,8 +26,7 @@ becomes transparent after a while and you can focus on the content instead.
 
 _Black_ makes code review faster by producing the smallest diffs possible.
 
-Try it out now using the [Black Playground](https://black.vercel.app). Watch the
-[PyCon 2019 talk](https://youtu.be/esZLCuWs_2Y) to learn more.
+Watch the [PyCon 2019 talk](https://youtu.be/esZLCuWs_2Y) to learn more.
 
 ---
 

docs/getting_started.md

@@ -9,10 +9,14 @@ how _Black_ will format your code. _Black_ isn't for everyone and you may find s
 that is a dealbreaker for you personally, which is okay! The current _Black_ code style
 [is described here](./the_black_code_style/current_style.md).
 
-## Try it out online
+## Try it out quickly
 
-Also, you can try out _Black_ online for minimal fuss on the
-[Black Playground](https://black.vercel.app) generously created by José Padilla.
+If you want a quick taste of _Black_ without creating a file first, format a snippet
+from the command line:
+
+```sh
+black --code "x =   {  'a':1,'b':2 }"
+```
 
 ## Installation
 

docs/index.md

@@ -15,8 +15,6 @@ _Black_ makes code review faster by producing the smallest diffs possible. Black
 code looks the same regardless of the project you're reading. Formatting becomes
 transparent after a while and you can focus on the content instead.
 
-Try it out now using the [Black Playground](https://black.vercel.app).
-
 ```{admonition} Note - Black is now stable!
 _Black_ is [successfully used](https://github.com/psf/black#used-by) by many projects,
 small and big. _Black_ has a comprehensive test suite, with efficient parallel tests,