fix 404 and intersphinx

Author: OriolAbril

docs/source/404.md

@@ -6,26 +6,8 @@ orphan: true
 
 **Sorry, we could not find this page**
 
-We are working on the next major release for PyMC,
-which will come with faster sampling, more flexible
-model building, multiple computational backends...
+Click on the navigation bar on top of the page to go to the right section
+of the default docs, or alternatively:
 
-::::{grid} 3
-:::{grid-item}
-![old banner](https://raw.githubusercontent.com/pymc-devs/pymc/v3/docs/logos/svg/PyMC3_banner.svg)
-:::
-:::{grid-item}
-:class: text-center
-{fas}`arrow-alt-circle-right;fa-5x`
-:::
-:::{grid-item}
-![new banner](https://raw.githubusercontent.com/pymc-devs/pymc/main/docs/logos/svg/PyMC_banner.svg)
-:::
-::::
-
-...and much better documentation too! However, to
-do so we have moved some files around and we have
-modified the base url in order to support multi version docs
-(you'll see the version switcher at the bottom right of the page).
-
-Back to {{ '[documentation homepage](https://docs.pymc.io/en/{}/)'.format(version_slug) }}
+* Go to the current [PyMC website homepage](https://www.pymc.io/)
+* Go to the homepage of [PyMC 3.x documentation](https://www.pymc.io/projects/docs/en/v3/)

docs/source/conf.py

@@ -127,7 +127,7 @@
 language = None
 
 # configure notfound extension to not add any prefix to the urls
-notfound_urls_prefix = "/en/latest/"
+notfound_urls_prefix = "/projects/docs/en/latest/"
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
@@ -189,9 +189,9 @@
     "aesara": ("https://aesara.readthedocs.io/en/latest/", None),
     "aeppl": ("https://aeppl.readthedocs.io/en/latest/", None),
     "home": ("https://www.pymc.io", None),
-    "pmx": ("https://docs.pymc.io/projects/experimental/en/latest", None),
+    "pmx": ("https://www.pymc.io/projects/experimental/en/latest", None),
     "numpy": ("https://numpy.org/doc/stable/", None),
-    "nb": ("https://docs.pymc.io/projects/examples/en/latest/", None),
+    "nb": ("https://www.pymc.io/projects/examples/en/latest/", None),
     "myst": ("https://myst-parser.readthedocs.io/en/latest", None),
     "myst-nb": ("https://myst-nb.readthedocs.io/en/latest/", None),
     "python": ("https://docs.python.org/3/", None),