[ENHANCEMENT] Update post URL retrieval to remove depreciated code

[mgrove36]

Is your feature request related to a problem? Please describe.
Depreciation of a feature means new implementation required. When building docs, post URL retrieval with a currently unknown method (code causing the issue hasn't yet been located) throws the following error:
Deprecation: A call to '{% post_url Installation/0000-01-02-arm_install %}' did not match a post using the new matching method of checking name (path-date-slug) equality. Please make sure that you change this tag to match the post's name exactly.

Describe the enhancement you'd like
New implementation of this unknown section of code to replace the depreciated version that is currently used.

Additional context
Cause of this issue is currently unknown.

[quartztester]

"0000-01-02-arm_install" as of current does not exist. Looks as though it it was trying to find that file from the test did not match a post. Looks as though the file was renamed to "0000-01-02-raspberry-pi.md".

@derneuere Is this issue still persistent?

[derneuere]

No this issue is no longer persistent! :)