Remove stale links from CS vs GH page (#316)

This PR removes 2 links that had become stale and led to nonexistent
pages.

docs/getting-started/github-vs-sourcegraph.mdx

@@ -82,7 +82,7 @@ You can also integrate Sourcegraph with other Git-based code hosts using [these]
 
 ### Searching repositories, branches, and forks
 
-GitHub allows you to search indexed code, but not all code is indexed. GitHub’s [current limitations](https://cs.github.com/about/faq#indexed-content) on indexed code are:
+GitHub allows you to search indexed code, but not all code is indexed. GitHub’s current limitations on indexed code are:
 
 * Files over 350 KiB and empty files are excluded
 * Only UTF-8 encoded files are included
@@ -166,7 +166,7 @@ Both GitHub and Sourcegraph display the most relevant search results first using
 
 GitHub analyzes how many matches are in the file, the quality of the matches, the kind of file, whether the searches match symbols, and the number of repository stars as inputs for ranking results.
 
-Sourcegraph uses a repository’s number of stars to [rank](https://docs.sourcegraph.com/dev/background-information/architecture/indexed-ranking) the most important repositories first. The priority of a repository can be altered by admins with this [configuration](https://sourcegraph.com/search?q=context:global+repo:%5Egithub%5C.com/sourcegraph/sourcegraph%24+repoRankFromConfig&patternType=regexp&_ga=2.18586544.827352295.1667227568-1057140468.1661198534&_gac=1.82582244.1665776224.CjwKCAjwkaSaBhA4EiwALBgQaJCOc6GlhIDQyg6HQScgfSBQpoFTUf7T_NNqEX5JaobtCS08GUEJuRoCIlIQAvD_BwE&_gl=1*5o6st*_ga*MTA1NzE0MDQ2OC4xNjYxMTk4NTM0*_ga_E82CCDYYS1*MTY2NzM0MDAzNy4xMDQuMS4xNjY3MzQxNjUyLjAuMC4w). There are several other heuristic signals that help to make sure that the most important documents are searched first, including:
+Sourcegraph uses a repository’s number of stars to [rank](https://docs.sourcegraph.com/dev/background-information/architecture/indexed-ranking) the most important repositories first There are several other heuristic signals that help to make sure that the most important documents are searched first, including:
 
 * Up rank files with a lot of symbols
 * Up rank small files