Update dependency SHA to v1.0.0-beta3 in README and website

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: leifericf

README.md

@@ -45,7 +45,7 @@ If it cannot be represented as plain data, it probably should not be in the libr
 Add eido as a git dependency in your `deps.edn`:
 
 ```clojure
-io.github.leifericf/eido {:git/tag "v1.0.0-beta2" :git/sha "218e9df"}
+io.github.leifericf/eido {:git/tag "v1.0.0-beta3" :git/sha "a8bba4b"}
 ```
 
 ## Quick Start

examples/site/pages.clj

@@ -96,7 +96,7 @@
           ";; deps.edn
 {:deps
  {io.github.leifericf/eido
-  {:git/tag \"v1.0.0-beta2\" :git/sha \"218e9df\"}}}"]]
+  {:git/tag \"v1.0.0-beta3\" :git/sha \"a8bba4b\"}}}"]]
    [:h4 "2. Render your first image"]
    [:p "Start a REPL via Calva (\"Jack-in\"), then evaluate:"]
    [:pre [:code