Add SECURITY.md, rename README.md, and fix stale repo URLs

[garyo]

Addresses the OpenFX findings from the ASWF project health report.

Changes

SECURITY.md (new) — adds a security policy at the repo root: vulnerability reporting via GitHub private security advisories, a 5-business-day acknowledgment SLA, a supported-versions table, and an OpenFX-specific security model section (the host/plug-in trust boundary — plug-ins are native code loaded into the host process).

README — renamed readme.md → README.md so GitHub surfaces it automatically. This also repairs the already-uppercase references in conanfile.py and pyproject.toml, and the casing reference in scripts/build-cmake.sh.

CONTRIBUTING.md

• Fixed three issue-tracker URLs: github.com/ofxa/openfx → github.com/AcademySoftwareFoundation/openfx.
• Fixed the copy-pasted mailing list [email protected] → [email protected].
• Fixed the broken [SECURITY.md] reference to a working link now that the file exists.

Repo-wide URL cleanup — replaced all remaining stale ofxa/openfx references and updated repo-relative links from the old master branch to main across README.md, STANDARD_PROCESS.md, release-notes.md, Documentation/sourceforge/index.html, and the Documentation/sources/**/*.rst files (also upgraded one http:// link to https://).

After this change there are zero remaining ofxa/openfx references and zero openfx/{blob,tree,raw}/master links in the tree.

[Copilot]

Pull request overview

This PR updates repository documentation and project metadata to address ASWF project health report findings by adding a security policy, standardizing README casing for GitHub, and refreshing stale repository/branch URLs throughout docs.

Changes:

• Added a root SECURITY.md describing vulnerability reporting, supported versions, and the host/plug-in trust boundary.
• Renamed/standardized README.md casing and adjusted references to match.
• Replaced stale ofxa/openfx and master-branch links with AcademySoftwareFoundation/openfx and main across markdown, HTML, and Sphinx .rst docs.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
STANDARD_PROCESS.md	Updates the “Standard Change Proposal” issue-template link to the current GitHub org/repo.
SECURITY.md	Introduces a security policy and reporting process at the repo root.
scripts/build-cmake.sh	Updates error text to reference README.md (matching renamed file casing).
release-notes.md	Updates programming guide link to the current repo/branch.
README.md	Fixes stale links and ensures README is properly surfaced by GitHub via correct casing.
Documentation/sourceforge/index.html	Updates the repository link to the current GitHub org/repo and uses https.
CONTRIBUTING.md	Fixes stale issue tracker URLs, mailing list address, and adds a working SECURITY.md link.
Documentation/sources/Reference/suites/ofxDrawSuiteReference.rst	Updates header-source link from master to main.
Documentation/sources/Reference/ofxThreadSafety.rst	Updates header-source link to current org/repo/branch.
Documentation/sources/Reference/ofxStructure.rst	Updates header-source links to current org/repo/branch.
Documentation/sources/Reference/ofxStatusCodes.rst	Updates header-source link to current org/repo/branch.
Documentation/sources/Reference/ofxParameter.rst	Updates header-source link from master to main.
Documentation/sources/Reference/ofxImageEffectAPI.rst	Updates multiple header-source links and org/repo references.
Documentation/sources/Reference/ofxImageEffectActions.rst	Updates header-source links from master to main.
Documentation/sources/Reference/ofxImageClip.rst	Updates header-source link to current org/repo/branch.
Documentation/sources/Reference/ofxCoreAPI.rst	Updates header-source links from master to main.
Documentation/sources/Guide/ofxExamples.rst	Updates repo link to current GitHub org/repo.
Documentation/sources/Guide/ofxExample1_Basics.rst	Updates example source links from master to main.
Documentation/sources/Guide/ofxExample2_Invert.rst	Updates example source link from master to main.
Documentation/sources/Guide/ofxExample3_Gain.rst	Updates example source link from master to main.
Documentation/sources/Guide/ofxExample4_Saturation.rst	Updates example source link from master to main.

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[lgritz]

LGTM

I like the clear SECURITY guide, good discussion about the boundaries.