pip: Update docs about using pip_find_build_deps script

+ remove old links to Cachito repository

Signed-off-by: Michal Šoltis <[email protected]>

docs/pip.md

@@ -432,16 +432,11 @@ but contains build dependencies rather than runtime dependencies.
 *Note: this file must contain all the transitive build dependencies of each of your transitive runtime dependencies
 (you are installing dependencies from source).*
 
-There's no great way to generate such a file. As far as we know, the best solution is pip-compile combined with this
-standalone script that lives in the old Cachito repo:
-[pip\_find\_builddeps.py](https://github.com/containerbuildsystem/cachito/blob/master/bin/pip_find_builddeps.py).
-
-#### Prerequisites
-
-Generate a [fully resolved requirements.txt](#requirementstxt)
-
-Get the script ([download](https://raw.githubusercontent.com/containerbuildsystem/cachito/master/bin/pip_find_builddeps.py)
-directly from Github, it has no runtime dependencies other than pip)
+There's no great way to generate such a file. Together with pip-compile, you can use the
+[hack/pip\_find\_build_deps.py](https://github.com/containerbuildsystem/cachi2/blob/main/hack/pip_find_build_deps.py)
+script if you already have our repository cloned. If not then you can download the script directly from Github
+[here](https://raw.githubusercontent.com/containerbuildsystem/cachi2/main/hack/pip_find_build_deps.py)
+(it has no runtime dependencies other than pip).
 
 If your project itself has build dependencies (typically defined in pyproject.toml), copy them to `requirements-build.in`.
 
@@ -466,10 +461,10 @@ pdm-pep517
 
 **Usage:**
 
-Run the `pip_find_builddeps.py` script and pip-compile the output:
+Run the `pip_find_build_deps.py` script and pip-compile the output:
 
 ```shell
-pip_find_builddeps.py requirements.txt \
+pip_find_build_deps.py requirements.txt \
   --append \
   --only-write-on-update \
   -o requirements-build.in