[doc] added section about local build on macos in README.md, updated docs, updated changelog

[doc] update docs, bump to version 1.3.0

[chore] update dependencies version, both for backend and static frontend, bump to version 1.2.2

[chore] update frontend dependencies version; update fastapi version to 0.109.2; pin onnxruntime version to 1.16.3; bump samgis version to 1.2.1

[refactor] move core instance segmentation (segment anything) functionality to samgis_core, bump to version 1.2.0

[docs] add CHANGELOG.md and link within sphinx docs, bump to samgis version 1.1.0

[feat] add two openapi docs builder scripts, update samgis version within docs, remove unused package.json

[docs] update docs to add openapi swagger content

[feat] add markdown support in sphinx

[docs] add configuration options

[docs] add more docs content

[docs] add first working sphinx docs build