Updated links

[radarhere]

https://github.com/python-pillow/Pillow/runs/7261653289?check_suite_focus=true#step:11:571

( deprecations: line 253) redirect https://www.freetype.org/ - permanently to https://freetype.org/

So I've replaced that link with https://freetype.org/

https://github.com/python-pillow/Pillow/runs/7261653289?check_suite_focus=true#step:11:582

(handbook/image-file-formats: line 830) broken https://spider.wadsworth.org/spider_doc/spider/docs/spider.html - HTTPSConnectionPool(host='spider.wadsworth.org', port=443): Max retries exceeded with url: /spider_doc/spider/docs/spider.html (Caused by ConnectTimeoutError(<urllib3.connection.HTTPSConnection object at 0x7fb6f707da50>, 'Connection to spider.wadsworth.org timed out. (connect timeout=None)'))

We could replace the link using the Wayback machine - https://web.archive.org/web/20210122004053/https://spider.wadsworth.org/spider_doc/spider/docs/spider.html

But if it is just a link for "more information about the SPIDER image processing package", then it would seem better to link to https://github.com/spider-em/SPIDER instead. You can see a link to the GitHub project on the Wayback page.