Bugfixes (#13)

* several fixes:

- fix #9 + #10: switched to koanf module and dropped support for HCL
- fix #11: disabling colors on windows
- fix #12: fixed race condition in go routine call inside for loop,
  images had been downloaded multiple times
- remove hcl support and use toml format (same thing, better parser)
- update documentation and example config on TOML format of config file
- use Config as arg instead of singular args
- use x/errgroup instead of sync.Waitgroup inside image download loop

---------

Co-authored-by: Thomas von Dein <tom@vondein.org>

README.md

@@ -66,12 +66,14 @@ To install after building either copy the binary or execute `sudo make install`.
 ```
 Usage: kleingebaeck [-dvVhmoc] [<ad-listing-url>,...]
 Options:
---user,-u <uid>        Backup ads from user with uid <uid>.
---debug, -d            Enable debug output.
---verbose,-v           Enable verbose output.
---output-dir,-o <dir>  Set output dir (default: current directory)
---manual,-m            Show manual.
---config,-c <file>     Use config file <file> (default: ~/.kleingebaeck).
+--user    -u <uid>      Backup ads from user with uid <uid>.
+--debug   -d            Enable debug output.
+--verbose -v            Enable verbose output.
+--outdir  -o <dir>      Set output dir (default: current directory)
+--limit   -l <num>      Limit the ads to download to <num>, default: load all.
+--config  -c <file>     Use config file <file> (default: ~/.kleingebaeck).
+--manual  -m            Show manual.
+--help    -h            Show usage.
 
 If one  or more <ad-listing-url>'s  are specified, only  backup those,
 otherwise backup all ads of the given user.
@@ -80,16 +82,15 @@ otherwise backup all ads of the given user.
 ## Configfile
 
 You can create a config file to save typing. By default
-`~/.kleingebaeck.hcl` is being used but you can specify one with
+`~/.kleingebaeck` is being used but you can specify one with
 `-c` as well.
 
 Format is simple:
 
 ```
 user = 1010101
-verbose = true
+loglevel = verbose
 outdir = "test"
-template = ""
 ```
 
 ## Usage