new look for the web pages

_site.yml

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+name: "Regression and Other Stories"
+output_dir: "."
+navbar:
+  title: "Regression and Other Stories"
+  left:
+    - text: "Book information"
+      href: index.html
+    - text: "Examples"
+      href: examples.html
+    - text: "Errata"
+      href: errata.html
+author: "Andrew Gelman, Jennifer Hill, Aki Vehtari"
+output:
+  html_document:
+    theme: readable
+    toc: true
+    toc_collapse: false
+    toc_depth: 3
+    toc_float: true

errata.Rmd

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+---
+title: "Regression and Other Stories - Errata"
+author: "Andrew Gelman, Jennifer Hill, Aki Vehtari"
+date: "Page updated: `r format.Date(file.mtime('index.Rmd'),'%Y-%m-%d')`"
+---
+
+-------------
+
+Errata (excluding minor typos) for the book.
+
+If you notice an error that is not mentioned in the errata below, submit an issue at https://github.com/avehtari/ROS-Examples/issues or send an email.
+
+## 1st (2020) printing
+
+- p. 11, the summary of the treatment-control comparison says "the treated units were 4.8 points higher than the controls, \bar{y} = 31.7 under the treatment and \bar{y} = 25.5 for the controls." The difference in shown means is 6.2 and not 4.8.  Not that these values change when rerunning the simulation. (thanks Desislava Petkova) 
+- p. 39, in the second sentence of the first full paragraph, "Figure 3.4 displays data on log metabolic rate vs. body mass indicating..." should be "log metabolic rate vs. log body mass" (thanks Ravi Shroff)
+- p. 42, the last line, in "Linear transformations" section "Exercise 3.5" should be "Exercise 3.6". (thanks Ed Berry)
+- p. 54, in "Comparisons, visual and numerical" subsection, "Figure 4.2" in the first sentence should be "Figure 4.3." (thanks Ravi Shroff)
+- p. 55 `se_weighted_avg <- sqrt(sum(W*se)^2)` should be `se_weighted_avg <- sqrt(sum((W*se)^2))` (thanks to Desislava Petkova)
+
+-------------