Minor corrections to README

Use an empty context for docker/podman image building

Update README to briefly mention Docker/Podman

class: Explain why \ignorespaces is required for CJK abstract

class: Fix the default position of photo to be left

resume: Update to use the new abstract environment

resume: Update PDF

class: Fix error of undefined \@photo@width

class: Replace \profilewidth with \@photo@width for clarity

github: Update the main workflow

Create GitHub Actions

Fix shape name from 'circle' to 'circular'

resume: Update sample usages on '\photo' command

README: Available on Overleaf and link to it

class: Switch Chinese font to 'Noto Serif CJK' since it's more common