build favicons; use devel-lintr

Author: IndrajeetPatil

.Rbuildignore

@@ -21,6 +21,7 @@
 ^inst/WORDLIST$
 ^inst/hextools$
 ^inst/hooks/.*$
+^pkgdown$
 ^revdep$
 ^tests/testmanual$
 ^tic\.R$

.pre-commit-config.yaml

@@ -21,6 +21,8 @@ repos:
           tests/testmanual/addins/r-valid\.R|
           )$
       - id: lintr
+        additional_dependencies:
+          - r-lib/lintr
         exclude: >
           (?x)^(
           inst/.*|