docs: add install.sh, Dependencies/Requirements sections

Add install.sh: system install as root, user install (~/.local, XDG)
as normal user, with a PATH warning and an uninstall subcommand. It
detects the bash-completion dir (underscore vs hyphen). Expand the
README Dependencies section (required vs optional) and point
Installation at the script; add a REQUIREMENTS section to the man page.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/mkhint.1.md b/mkhint.1.md
index 28f294b..a3bffe2 100644
--- a/mkhint.1.md
+++ b/mkhint.1.md
@@ -41,6 +41,14 @@ After a version-changing update, **mkhint** dispatches **slackrepo** for the
 affected package: `slackrepo update` if the package is already built in the
 package repository, `slackrepo build` if it is not.
 
+# REQUIREMENTS
+
+Required: **slackrepo**, **wget**, **nvchecker** (which also provides
+**nvtake**), and **jq**. Optional: **git** (nicer side-by-side diffs, falls back
+to `diff -y`), **less** (paging in **\--info**), and **tput** (color on a TTY).
+Coreutils (**perl**, **awk**, **sed**, **grep**, **md5sum**) are assumed from a
+base Slackware install.
+
 # OPTIONS
 
 **\--set-version**, **-V** *VERSION*