drop mentions of Branchable

The book is no longer there. Also otherwise update the technicalities
section.

2 files changed, 4 insertions, 19 deletions

diff --git a/introduction.mdwn b/introduction.mdwn
index da815bf..157c686 100644
--- a/introduction.mdwn
+++ b/introduction.mdwn
@@ -98,22 +98,11 @@ control, you'll be fine. Go read.
 Technicalities
 --------------
 
-This book is written using an [Ikiwiki](https://ikiwiki.info/) instance
-at <https://gtdfh.branchable.com/>,
-hosted on the [Branchable](https://www.branchable.com/) service. (I am
-involved in running Branchable.)
-
-Ikiwiki input is in Markdown format. I use scripts and tools to convert
-that into PDF, EPUB, and Mobipocket formats, for reading outside a browser.
-I'm currently using [Pandoc](https://pandoc.org/) and
-[Calibre's ebook-convert](https://calibre-ebook.com/) to do this.
+This book is written using an [Ikiwiki](https://ikiwiki.info/)
+instance, used as a static site generator,
 
 The book is licensed under a CC-BY-SA 3.0 (Unported) license. However,
-the site is only editable by myself, at least for now. I gratefully
-accept suggestions and will consider patches, but since the book explains
-what I do, I am not sure I want everyone to be able to edit it. If you want
-to make your own version of the book, feel free to branch the site on
-Branchable and make any changes you like to the content.
+the site is only editable by myself.
 
 "Getting Things Done" and "GTD" are registered trademarks of the
 David Allen Company.
diff --git a/sidebar.mdwn b/sidebar.mdwn
index 3af119e..3d9fa44 100644
--- a/sidebar.mdwn
+++ b/sidebar.mdwn
@@ -12,11 +12,7 @@ See also:
 <hr />
 
 This is a book-type site written by
-Lars Wirzenius.
-
-* [My home page](https://liw.fi/)
-* [My blog](https://blog.liw.fi)
-* [Branchable](https://www.branchable.com/)
+[Lars Wirzenius](https://liw.fi/).
 
 This site is not publically editable, but I welcome comments and feedback,
 via the site's commenting system or via e-mail.