vimhelp: Use './' instead of index.html in hybrid web mode

Also update sitemap generation script to do the same. This makes sure we
will never have any public links that can link to index.html which we
don't want to be visible.

Author: ychin

scripts/generate_sitemap

@@ -7,7 +7,7 @@ set -e -o pipefail
 # We also exclude the redirect.html since it's not really useful to crawl.
 echo "https://macvim.org/docs/"
 for f in *.html; do
-    if [[ "$f" != "redirect.html" ]]; then
+    if [[ "$f" != "redirect.html" && "$f" != "index.html" ]]; then
         echo "https://macvim.org/docs/$f"
     fi
 done

vimhelp/vimhelp/vimh2h.py

@@ -186,8 +186,8 @@ def add_tags(self, filename, contents):
 
     def do_add_tag(self, filename, tag):
         if filename == "help.txt":
-            if self._mode == "online":
-                htmlfilename = "/"
+            if self._mode != "offline":
+                htmlfilename = "./"
             else:
                 htmlfilename = "index.html"
         else:
@@ -247,7 +247,7 @@ def to_redirect_html(self):
 
         filename = "redirect"
         static_dir = "/" if self._mode == "online" else ""
-        helptxt = "./" if self._mode == "online" else "index.html"
+        helptxt = "./" if self._mode != "offline" else "index.html"
         sidebar_headings = None
 
         current_time = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%SZ")
@@ -379,7 +379,7 @@ def to_html(self, filename, contents):
                 out.append(FAQ_LINE)
 
         static_dir = "/" if self._mode == "online" else ""
-        helptxt = "./" if self._mode == "online" else "index.html"
+        helptxt = "./" if self._mode != "offline" else "index.html"
 
         current_time = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%SZ")