[docs] Update jekyll local command

- Local links break in Jekyll 4.x since absolute_url uses the value
  from _config.yml. This forces Jekyll to use localhost:4000 as the
  base url

Gemfile

@@ -1,13 +1,5 @@
 source "https://rubygems.org"
 
-# Hello! This is where you manage which Jekyll version is used to run.
-# When you want to use a different version, change it below, save the
-# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
-#
-# bundle exec jekyll serve
-#
-# This will help ensure the proper Jekyll version is running.
-# Happy Jekylling!
 gem "jekyll", "~> 4.2.2"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and

HACKING.md

@@ -43,7 +43,7 @@ bundle exec jekyll --version
 Run the site locally:
 
 ```bash
-$ bundle exec jekyll serve
+$ bundle exec jekyll serve --host localhost --port 4000
 ```
 
 Browse to `http:https://localhost:4000` and you should see the site running locally. If you find any errors at this stage, check [Jekyll's troubleshooting page](https://jekyllrb.com/docs/troubleshooting/#configuration-problems) or [ask a question in the Q&A category](https://github.com/endoflife-date/endoflife.date/discussions/new/) on GitHub Discussions.