docs(readme): add mention of where Emacs source is fetched from

Also fix some typos.

.github/workflows/build.yml

@@ -2,7 +2,7 @@
 name: Build
 on:
   schedule:
-    - cron: "35 2 * * *"
+    - cron: "0 0 * * *"
   workflow_dispatch:
     inputs:
       gitRef:

README.md

@@ -1,6 +1,12 @@
-# Emacs Builds
+<p align="center">
+  <img width="192px" src="https://github.com/emacs-mirror/emacs/raw/emacs-27.2/etc/images/icons/hicolor/scalable/apps/emacs.svg" alt="Logo">
+</p>
 
-<p>
+<h1 align="center">
+  Emacs Builds
+</h1>
+
+<p align="center">
   <a href="https://github.com/jimeh/emacs-builds/releases">
     <img src="https://img.shields.io/github/v/tag/jimeh/emacs-builds?label=nightly" alt="GitHub tag (latest SemVer)">
   </a>
@@ -13,44 +19,68 @@ alt="GitHub issues">
   </a>
 </p>
 
-Nightly binary builds of Emacs for macOS, with native-compilation enabled, as a
-completely self-contained Emacs.app application bundle.
+<p align="center">
+  <strong>
+    Nightly binary builds of Emacs for macOS as a self-contained Emacs.app,
+    with native-compilation.
+  </strong>
+</p>
 
 ## Features
 
-- Self-contained Emacs.app application, with no external dependencies.
+- Self-contained Emacs.app application bundle, with no external dependencies,
+  built with the [jimeh/build-emacs-for-macos][] build script.
 - Native-compilation is enabled in nightly builds from the `master` branch of
   Emacs, and should just work without the need to install GCC, libgccjit, or any
   other dependencies.
 - Includes the [fix-window-role][] and [system-appearance][] patches from the
   excellent [emacs-plus][] project.
-- Build are creation is transparent and public through the use of GitHub
-  Actions, allowing anyone to inspect git commit SHAs, full source code, and
-  exact commands used to produce a build. This is especially important right now
-  as builds are not yet signed and notarized.
+- Emacs source is fetched from the [emacs-mirror/emacs][] GitHub repository.
+- Build creation is transparent and public through the use of GitHub Actions,
+  allowing anyone to inspect git commit SHAs, full source code, and exact
+  commands used to produce a build. This is especially important right now as
+  builds are not yet signed and notarized.
 
+[jimeh/build-emacs-for-macos]: https://github.com/jimeh/build-emacs-for-macos
 [fix-window-role]:
   https://github.com/d12frosted/homebrew-emacs-plus/blob/master/patches/emacs-28/fix-window-role.patch
 [system-appearance]:
   https://github.com/d12frosted/homebrew-emacs-plus/blob/master/patches/emacs-28/system-appearance.patch
 [emacs-plus]: https://github.com/d12frosted/homebrew-emacs-plus
+[emacs-mirror/emacs]: https://github.com/emacs-mirror/emacs
+
+## System Requirements
+
+- Intel-based Mac running macOS 10.15.x or later.
 
 ## Downloads
 
 See the [Releases][] page to download latest builds.
 
+Nightly builds of Emacs are for the part just fine, but if you don't like living
+too close to the edge, see issue [#7 Known Good Nightly Builds][7] for a list of
+recent nightly builds which have been actively used by a living being without
+any issues.
+
 [releases]: https://github.com/jimeh/emacs-builds/releases
+[7]: https://github.com/jimeh/emacs-builds/issues/7
 
 ## Build Process
 
 Building Emacs is done using the [jimeh/build-emacs-for-macos][] build script,
-executed within a GitHub Actions workflow. Full build history is available
-[here][actions].
+executed within a GitHub Actions [workflow][]. This is why macOS 10.15.x or
+later is required, as it's the oldest version of macOS available in GitHub
+Actions.
+
+[workflow]:
+  https://github.com/jimeh/emacs-builds/blob/main/.github/workflows/build.yml
+
+Full history for all builds is available on GitHub Actions [here][actions].
 
 [jimeh/build-emacs-for-macos]: https://github.com/jimeh/build-emacs-for-macos
 [actions]: https://github.com/jimeh/emacs-builds/actions
 
-Nightly builds are scheduled for 2:35 UTC every night, based on the latest
+Nightly builds are scheduled for 0:00 UTC every night, based on the latest
 commit from the `master` branch of the [emacs-mirror/emacs][] repository. This
 means a nightly build will only be produced if there have been new commits since
 the last nightly build.
@@ -60,22 +90,16 @@ the last nightly build.
 ## Untrusted Application
 
 Currently builds are not signed or notarized, meaning macOS cannot verify
-Emacs.app came from a trusted developer, and by default you are not even given
-the option to trust the app and open it anyway.
+Emacs.app came from a trusted developer, and by default you are not given an
+option to trust the app and open it.
 
-Simplest way around this: Instead of double-clicking on Emacs.app in Finder,
-right-click (or control-click) on Emacs and select "Open". You will then be
-given the same warning as before, with a "Open" button now available to open the
-app anyway. After that you can open the application like normal without any
-warnings.
+Simplest way around this is to right-click (or control-click) on the Emacs app
+in Finder and select "Open". You will then be given the same warning as before,
+but with a "Open" button now available to trust and open the app. After that you
+can open the application like normal without any warnings.
 
-## To-Do
+## Issues / To-Do
 
-- [ ] Sign and notarize builds.
-- [ ] Builds for stable versions of Emacs.
-- [ ] Populate GitHub Release description with relevant info about the build,
-      including a link to the GitHub Actions workflow run that produced the
-      build.
-- [ ] (Eventually) support Apple Silicon mac builds when native-compilation
-      actually works on Apple Silicon.
-- [ ] (Eventually) support builds for Linux.
+Please see [Issues][] for details of things to come, or to report issues.
+
+[issues]: https://github.com/jimeh/emacs-builds/issues

cmd/github-release/publish_cmd.go

@@ -28,7 +28,7 @@ func publishCmd() *cli.Command {
 				Name:    "prerelease",
 				Usage:   "Git SHA of repo to create release on",
 				EnvVars: []string{"RELEASE_PRERELEASE"},
-				Value:   true,
+				Value:   false,
 			},
 		},
 		Action: actionHandler(publishAction),