Chore: Refactor documentation from README to DEVELOP

Author: amotl

DEVELOP.md

@@ -9,7 +9,7 @@ with the [Fivetran SDK Development Guide].
 ```shell
 git clone https://github.com/crate/cratedb-fivetran-destination.git
 cd cratedb-fivetran-destination
-uv venv --seed
+uv venv --python 3.13 --seed .venv
 source .venv/bin/activate
 uv pip install --upgrade --editable='.[develop,test]'
 ```
@@ -68,8 +68,16 @@ docker run --rm -it \
   --tester-type destination --port 50052
 ```
 
-## OCI builds
+## Building
 
+### Standalone builds
+Build a standalone executable using PyInstaller.
+```shell
+uv pip install --upgrade --editable='.[release]'
+uv run poe build-app
+```
+
+### OCI builds
 Build OCI images on your workstation.
 ```shell
 export BUILDKIT_PROGRESS=plain

README.md

@@ -51,14 +51,8 @@ i.e. pre-alpha.
 For installation per [PyPI package][PyPI], [OCI image], [standalone executable],
 and usage information, please visit the [handbook] document.
 
-## Build
-Build a standalone executable using PyInstaller:
-```shell
-git clone https://github.com/crate/cratedb-fivetran-destination
-cd cratedb-fivetran-destination
-uv pip install --upgrade --editable='.[release]'
-uv run poe build-app
-```
+For building the application, or hacking on it, please refer to the
+[development sandbox] documentation.
 
 ## Project Information
 
@@ -80,6 +74,7 @@ The project uses the Apache license, like CrateDB itself.
 [CrateDB]: https://cratedb.com/database
 [CrateDB Cloud]: https://cratedb.com/database/cloud
 [CrateDB destination adapter for Fivetran]: https://cratedb.com/docs/guide/integrate/fivetran/
+[development sandbox]: https://github.com/crate/cratedb-fivetran-destination/blob/main/DEVELOP.md
 [Fivetran]: https://www.fivetran.com/
 [Fivetran SDK Development Guide]: https://github.com/fivetran/fivetran_sdk/blob/main/development-guide.md
 [handbook]: https://github.com/crate/cratedb-fivetran-destination/blob/main/docs/handbook.md