Add comment about allowed node version

node 17.x is the default for homebrew which doesn't work with this repo.
Make allowed node version more explicit to avoid dev confusion

.github/workflows/build.yml

@@ -44,6 +44,7 @@ jobs:
         with:
           java-version: 1.8
 
+      # This is the latest node version of we can run
       - name: Set up Node
         uses: actions/setup-node@v2
         with:

README.md

@@ -82,7 +82,7 @@ We also have [a dedicated page](https://github.com/logseq/logseq/blob/master/COD
 
 ### 1. Requirements
 
-- [Node.js](https://nodejs.org/en/download/) & [Yarn](https://classic.yarnpkg.com/en/docs/install/)
+- [Node.js](https://nodejs.org/en/download/) (See [build.yml](.github/workflows/build.yml) for allowed version)  & [Yarn](https://classic.yarnpkg.com/en/docs/install/)
 - [Java & Clojure](https://clojure.org/guides/getting_started). (If you run into `Execution error (FileNotFoundException) at java.io.FileInputStream/open0 (FileInputStream.java:-2). -M:cljs (No such file or directory)`, it means you have a wrong Clojure version installed. Please uninstall it and follow the instructions linked.)
 
 ### 2. Compile to JavaScript