Bump version to 1.0.3 and update changelog for housekeeping changes

- Updated version number in ai-alt-text.php, package.json, and readme.txt to 1.0.3.
- Added housekeeping entry in CHANGELOG.md for version 1.0.3.
- Revised README.md to clarify the description of the plugin.
- Removed redundant auto-generate on upload feature description from README.md and readme.txt.

Merge pull request #3 from soderlind/l10n

Add initial translation template for AI Alt Text plugin

Merge pull request #2 from soderlind/edit/media

Update version to 1.0.1 and enhance media generation features

Add GitHub funding configuration and workflows for manual and automat…

…ic release zips

- Created .github/FUNDING.yml to support various funding platforms.
- Added .github/workflows/manually-build-zip.yml for manual release zip creation.
- Added .github/workflows/on-release-add.zip.yml for automatic release zip generation upon publishing.
- Both workflows include steps for checking out the code, building the plugin, archiving the release, and releasing the zip file.