README.md: Remove some unnecessary material

- The docs are now available online.
- Remove reference to a module that probably shouldn't be used.

Change-Id: If926692eeb7db7100b77d3e9e1b0b9030e593d78
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/34040
Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: David Rogers <davidrogers@google.com>
diff --git a/README.md b/README.md
index c8804b9..0c1fe81 100644
--- a/README.md
+++ b/README.md
@@ -34,10 +34,6 @@
 different Pigweed module offerings, refer to "Module Guides" section in the full
 documentation.
 
-Note: For now the full documentation is not available online; you must build
-it. Building the docs is easy; see the [getting started
-guide](docs/getting_started.md) for how.
-
 ## `pw_watch` - Build, flash, run, & test on save
 
 In the web development space, file system watchers are prevalent. These watchers
@@ -130,12 +126,6 @@
    provides selected C++17 standard library components that are compatible with
    C++11 and C++14.
 
- - `pw_minimal_cpp_stdlib`: An entirely incomplete implementation of the C++17
-   standard library, that provides some of the primitives needed by Pigweed
-   itself. Useful for projects that want to use Pigweed, but don’t enable the
-   typical standard C++ libraries like GNU’s libstdc++ or LLVM’s libc++. Don’t
-   use this module unless you know what you are doing.
-
  - `pw_tokenizer`: Replace string literals from log statements with 32-bit
    tokens, to reduce flash use, reduce logging bandwidth, and save formatting
    cycles from log statements at runtime.