Fix URL for aget script

As this is a copy from the actual HTML sitting on attrition.org, the link to the aget script was broken here and I redirected it to the github location.

README.md

@@ -6,7 +6,7 @@ By early June, we had 1300 defacements mirrored. Some of those from before Janua
 
 Between December, 1999 and April, 2000, we provided comprehensive operating system breakouts and additional statistic graphs to better visualize the data we were collecting. This led to web server statistics, defacement trends, and active group tracking through August. 2000 turned into a grind and throughout the year the time required to capture defacements before they were fixed required working from wake to sleep. With only a few of us on mirror duty it meant little to no time off and checking in at a computer many times a day. We took a quick break in the middle of the year to attend the [BlackHat Briefings](https://www.blackhat.com/html/bh-media-archives/bh-archives-2000.html) where Munge, Punkis, and Jericho presented on the mirror activity on July 26 ([PPT presentation](https://attrition.org/security/conferences/BH-2000-fff-public.ppt)).
 
-The mirroring and gathering of information that made that possible was due to using a shell script we wrote called "aget" (Attrition Get). Just grabbing a copy of a site with wget didn't cut it from early on so the script started adding functionality and sanity checking. The final version, 5.7, was just under 1,000 lines. For the first time that script is now being published ([aget-5.7.txt](https://attrition.org/mirror/aget-5.7.txt)) so you have a better idea how complicated some of the logistics were.
+The mirroring and gathering of information that made that possible was due to using a shell script we wrote called "aget" (Attrition Get). Just grabbing a copy of a site with wget didn't cut it from early on so the script started adding functionality and sanity checking. The final version, 5.7, was just under 1,000 lines. For the first time that script is now being published ([aget-5.7.txt](https://github.com/attrition-org/web-hack-mirror/blob/main/mirror/tools/aget-5.7.sh)) so you have a better idea how complicated some of the logistics were.
 
 Early in 2001, more attention was being given to these defacements and more outside people offered commentary. They would 'analyze' our data, sometimes via cursory skim, and then serve up their 'expert' opinion. Meanwhile we were swamped trying to gather the data. One trend that was catching people's eye was the country statistics. At some point the rumor of a 'defacement' war between US and Chinese groups was thrown around. Based on what we saw, Sioda and Jericho later wrote a [commentary that addressed these rumors](https://attrition.org/security/commentary/cn-us-war.html).