Minor README improvements (#18260)

Author: hauntsaninja

README.md

@@ -17,8 +17,8 @@ Got a question?
 
 We are always happy to answer questions! Here are some good places to ask them:
 
-- for anything you're curious about, try [gitter chat](https://gitter.im/python/typing)
 - for general questions about Python typing, try [typing discussions](https://github.com/python/typing/discussions)
+- for anything you're curious about, try [gitter chat](https://gitter.im/python/typing)
 
 If you're just getting started,
 [the documentation](https://mypy.readthedocs.io/en/stable/index.html)
@@ -30,7 +30,6 @@ If you think you've found a bug:
 - check our [common issues page](https://mypy.readthedocs.io/en/stable/common_issues.html)
 - search our [issue tracker](https://github.com/python/mypy/issues) to see if
   it's already been reported
-- consider asking on [gitter chat](https://gitter.im/python/typing)
 
 To report a bug or request an enhancement:
 
@@ -101,8 +100,6 @@ repo directly:
 
 ```bash
 python3 -m pip install -U git+https://github.com/python/mypy.git
-# or if you don't have 'git' installed
-python3 -m pip install -U https://github.com/python/mypy/zipball/master
 ```
 
 Now you can type-check the [statically typed parts] of a program like this:
@@ -118,14 +115,16 @@ programs, even if mypy reports type errors:
 python3 PROGRAM
 ```
 
-You can also try mypy in an [online playground](https://mypy-play.net/) (developed by
-Yusuke Miyazaki). If you are working with large code bases, you can run mypy in
+If you are working with large code bases, you can run mypy in
 [daemon mode], that will give much faster (often sub-second) incremental updates:
 
 ```bash
 dmypy run -- PROGRAM
 ```
 
+You can also try mypy in an [online playground](https://mypy-play.net/) (developed by
+Yusuke Miyazaki).
+
 [statically typed parts]: https://mypy.readthedocs.io/en/latest/getting_started.html#function-signatures-and-dynamic-vs-static-typing
 [daemon mode]: https://mypy.readthedocs.io/en/stable/mypy_daemon.html
 
@@ -134,18 +133,17 @@ Integrations
 
 Mypy can be integrated into popular IDEs:
 
+- VS Code: provides [basic integration](https://code.visualstudio.com/docs/python/linting#_mypy) with mypy.
 - Vim:
   - Using [Syntastic](https://github.com/vim-syntastic/syntastic): in `~/.vimrc` add
     `let g:syntastic_python_checkers=['mypy']`
   - Using [ALE](https://github.com/dense-analysis/ale): should be enabled by default when `mypy` is installed,
     or can be explicitly enabled by adding `let b:ale_linters = ['mypy']` in `~/vim/ftplugin/python.vim`
 - Emacs: using [Flycheck](https://github.com/flycheck/)
 - Sublime Text: [SublimeLinter-contrib-mypy](https://github.com/fredcallaway/SublimeLinter-contrib-mypy)
-- Atom: [linter-mypy](https://atom.io/packages/linter-mypy)
-- PyCharm: [mypy plugin](https://github.com/dropbox/mypy-PyCharm-plugin) (PyCharm integrates
-  [its own implementation](https://www.jetbrains.com/help/pycharm/type-hinting-in-product.html) of [PEP 484](https://peps.python.org/pep-0484/))
-- VS Code: provides [basic integration](https://code.visualstudio.com/docs/python/linting#_mypy) with mypy.
-- pre-commit: use [pre-commit mirrors-mypy](https://github.com/pre-commit/mirrors-mypy).
+- PyCharm: [mypy plugin](https://github.com/dropbox/mypy-PyCharm-plugin)
+- pre-commit: use [pre-commit mirrors-mypy](https://github.com/pre-commit/mirrors-mypy), although
+  note by default this will limit mypy's ability to analyse your third party dependencies.
 
 Web site and documentation
 --------------------------
@@ -171,8 +169,6 @@ contributors of all experience levels.
 
 To get started with developing mypy, see [CONTRIBUTING.md](CONTRIBUTING.md).
 
-If you need help getting started, don't hesitate to ask on [gitter](https://gitter.im/python/typing).
-
 Mypyc and compiled version of mypy
 ----------------------------------
 
@@ -190,4 +186,4 @@ To use a compiled version of a development
 version of mypy, directly install a binary from
 <https://github.com/mypyc/mypy_mypyc-wheels/releases/latest>.
 
-To contribute to the mypyc project, check out <https://github.com/mypyc/mypyc>
+To contribute to the mypyc project, check out the issue tracker at <https://github.com/mypyc/mypyc>