docs: add a bit more detail to webdev, Ruby 3.2

Signed-off-by: Henry Schreiner <[email protected]>

.gitattributes

@@ -1,2 +1,3 @@
 
 *.min.*               binary
+*.svg                 binary

.github/actions/prepare-build-site/action.yml

@@ -4,7 +4,7 @@ inputs:
   ruby-version:
     description: "Version of ruby to prepare"
     required: false
-    default: "3.1"
+    default: "3.2"
 
 runs:
   using: composite

pages/docs/webdev.md

@@ -13,26 +13,39 @@ You can always click the edit button to make small edits to the website source,
 
 ### Installing Ruby
 
-Visit [this page](https://jekyllrb.com/docs/installation/) for information about installing Ruby if your current version is too old; the instructions there form the basis for what you see here, and come in variants for all major operating systems.
-You should have Ruby 2.6+ for Jekyll; 3.1 recommended and used in CI. You can use rbenv to manage multiple ruby versions. On macOS with homebrew, you'll want:
+Visit [this page](https://jekyllrb.com/docs/installation/) for information
+about installing Ruby if your current version is too old; the instructions
+there form the basis for what you see here, and come in variants for all major
+operating systems.  You should have Ruby 2.6+ for Jekyll; 3.1+ recommended and
+used in CI. You can use rbenv to manage multiple ruby versions. On macOS with
+homebrew, you'll want:
 
 ```bash
 brew install rbenv
 ```
 
-You'll need to run `rbenv init` and follow the instructions for your current shell. After you've installed rbenv on your system, use:
+You'll need to run:
 
 ```bash
-rbenv install 3.1.2
+rbenv init
 ```
 
-to get a current version of ruby. Then, inside the main iris-hep website directory, run:
+and **then follow the instructions printed for your current shell**. After you've installed rbenv on your system, use:
 
 ```bash
-rbenv local 3.1.2
+rbenv install 3.2.1
 ```
 
-This will run the Ruby you just built whenever you enter this directory. You'll want to install bundler too:
+to get a current version of Ruby downloaded and built for your system. Then,
+inside the main iris-hep website directory, run:
+
+```bash
+rbenv local 3.2.1
+```
+
+This will add a file (`.ruby-version`, if you are curious) to your local
+directory that rbenv's shell integration will enable whenever you enter this
+directory. You'll want to install bundler too:
 
 ```bash
 gem install bundle
@@ -75,7 +88,7 @@ If you want to also perform the full link checking without exclusions, you can r
 bundle exec rake checkall
 ```
 
-If you are not familiar with it, `rake` is short for "Ruby make". The `clean` and `clobber` targets are available (the later removes the Inspire-HEP cache as well). You can also run `bundle exec jekyll ...` directly.
+If you are not familiar with it, `rake` is short for "Ruby make". The `clean` and `clobber` targets are available (the later removes the Inspire-HEP cache as well). You can see all available tasks with `bundle exec rake --tasks`. You can also run `bundle exec jekyll ...` directly.
 
 ### Updating javascript files
 
@@ -87,6 +100,20 @@ cat assets/js/myfile.js | openssl dgst -sha384 -binary | openssl base64 -A
 
 Run the site locally and verify no warnings appear in your terminal. Also turn on your browser's debugger and make sure no warnings are emitted.
 
+### Updating Ruby files
+
+If you edit Ruby files, you should run `rubocop` to verify:
+
+```bash
+bundle exec rake rubocop
+```
+
+If it suggests changes, you can often apply them automatically:
+
+```bash
+bundle exec rake rubocop:auto_correct
+```
+
 ### Styles
 
 Most style changes should be set in `assets/css/style.scss`. Some basic changes, like color variables, are set in the `_sass` directory. Please remember to consider multiple screen widths, printing (for relevant pages), and dark mode when changing or adding styles. You can see the defined colors [here](/docs/logos).