remove deprecated argument options (--level and -external now driving by the -match rules), update --follow documentation

README.md

@@ -32,10 +32,8 @@ At this moment, project under development, some [features](#features) already im
     * [x] Original (`--keep`)
   * [x] `--match` regex URL
   * [x] `--unique` snap version or sync with existing copy
-  * [ ] Configurable redirect levels to `--follow`
-  * [ ] Crawl depth `--level` limit
+  * [x] Configurable redirect levels to `--follow`
   * [ ] Document size limit to download
-  * [ ] Follow `--external` links on crawl
 
 ## Environment
 
@@ -71,6 +69,7 @@ src/gemini-dl.php --source gemini://.. --target /path/to/download
 -a, --absolute - no value, links to absolute filepath (ignored on --keep), disabled by default
 -c, --crawl    - no value, crawl document links (entire capsule download), disabled by default
 -d, --delay    - integer, pause between requests to prevent abuse (seconds), 1 by default
+-f, --follow   - integer, follow redirects on --crawl, 0 by default
 -i, --index    - string, index filename of directory listing, index.gmi by default
 -h, --help     - no value, show available commands
 -k, --keep     - no value, keep original links (--crawl mode only), disabled by default
@@ -78,11 +77,4 @@ src/gemini-dl.php --source gemini://.. --target /path/to/download
 -r, --raw      - no value, include meta headers (--keep option ignored), disabled by default
 -u, --unique   - no value, append snap version as folder timestamp, disabled by default
 
-# Experimental (in development)
-
--e, --external - no value, follow external hosts, disabled by default
--f, --follow   - integer, follow redirects on --crawl, 0 by default
--l, --level    - integer, depth to --crawl, 0 by default
-```
-
 * show in CLI: `gemini-dl.php --help`