docs: document publish procedures

docs/publish.md

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+# Publish procedure
+
+## Version 1
+For publishing v1 of the plugin which supports webpack 4, checkout `v1` branch, and run the following commands:
+```bash
+# checkout branch
+git checkout v1
+
+# pull the latest code
+git pull
+
+# make sure dependencies are in correct version
+yarn
+
+# bump package version
+yarn release
+
+# create build
+yarn build
+
+# publish to npm (OTP needed)
+npm publish
+
+# push code and trigger github release creation
+git push
+```
+
+## Version 2
+For publishing v2 of the plugin which supports webpack 5, checkout `develop` branch, and run the following commands:
+```bash
+# checkout branch
+git checkout develop
+
+# pull the latest code
+git pull
+
+# switch to master branch
+git checkout master
+
+# pull the latest code from master
+git pull
+
+# merge code from develop branch
+git merge --no-ff develop
+
+# make sure dependencies are in correct version
+yarn
+
+# bump package version
+yarn release
+
+# create build
+yarn build
+
+# publish to npm (OTP needed)
+npm publish
+
+# push code and trigger github release creation
+git push
+```