gnu: Remove and deprecate tidy for tidy-html

* gnu/packages/web.scm (tidy): Change to deprecated alias for tidy-html
* gnu/packages/pumpio.scm (pumpa): Use tidy-html instead of tidy and correct
header name.
* gnu/packages/markup.scm (hoedown):
* gnu/packages/photo.scm (enblend-enfuse):
* gnu/packages/php.scm (php):
* gnu/packages/python-xyz.scm (python-pytidylib):
Use tidy-html instead of tidy.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/python-xyz.scm

@@ -27219,7 +27219,7 @@ be necessary when using @code{cmd}.")
                  (("ctypes\\.util\\.find_library\\('tidy'\\)")
                   (format #f "'~a'" libtidy)))
                #t))))))
-    (inputs (list tidy))
+    (inputs (list tidy-html))
     (home-page "https://github.com/countergram/pytidylib")
     (synopsis "Python wrapper for HTML Tidy library")
     (description