add packaging page to docs/tutorials (#3355)

docs/tutorials/packaging.md

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+# Packaging Pwndbg
+
+Previously, packagers were required to create a `.skip-venv` file if they wanted to make sure Pwndbg used system installed python packages. Also, they had to deal with the fact that Pwndbg was invoked from the `~/.gdbinit` file.
+
+As of version 2025.10.10, you don't need to worry about those problems anymore. The entrypoints to Pwndbg are the `pwndbg` and `pwndbg-lldb` commands as defined in the `[project.scripts]` section of the `pyproject.toml` file. The `.skip-venv` file is also not necessary as Pwndbg will detect that a virtual environment is not being used at runtime. The method you use to package any python package will just work with Pwndbg without any workarounds.
+
+!!! info
+    If you're curious, the PR that introduced these changes is [#3199](https://github.com/pwndbg/pwndbg/pull/3119). There is a general packaging thread in #3124. For reference, the Pwndbg package for Gentoo has been updated in this PR: https://github.com/gentoo/gentoo/pull/44181.