ci: bump actions/checkout to v4

Allow updating the dmgs on a release

Merge pull request #52 from sergeypanin1994/main

fix(docs): fixed typos and improved clarity in teaBASE documentation

fix(docs): corrected errors in Clean Install Guide

fix: update Twitter URL to x.com format

chore: fix typo for Sources/teaBASE+git.m

Fix xib warnings

center the layout while keeping the width at 450

Update screenshot image

More utis

Merge pull request #37 from stevenlei/feat/improve-pkgx-detection

Open buttons

Fixes #43

Fix typo