Update README.md

[weiiwang01]

Applicable spec:

Overview

Update the README of the penpot charm based on the new template for IS charms.

Rationale

Juju Events Changes

Module Changes

Library Changes

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated
• The PR is tagged with appropriate label (urgent, trivial, complex)

[erinecon]

Thanks for updating the README -- I think it looks great!

I approve of the changes 👍 not giving an official approval due to the changes in .trivyignore

[github-actions]

Test coverage for 84acb9f

Name           Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------
src/charm.py     244     29     68     17    85%   101-102, 114-116, 130-131, 140-142, 152-154, 163, 170-171, 270, 289, 318, 350, 366, 372, 374, 388, 416, 435, 449, 486, 531
----------------------------------------------------------
TOTAL            244     29     68     17    85%

Static code analysis report

Run started:2024-12-16 05:34:00.502683

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1221
  Total lines skipped (#nosec): 1
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):