Docs: Fix broken links (#8208)

* Docs: Fix broken links

* Reduce concurrency

* Add gnu to ignore

docs/.lycheeignore

@@ -25,3 +25,4 @@ s3://
 https://lakefs.io/
 https://lakefs.acme.com/
 https://www.java.com/en/download/help/mac_install.html
+https://www.gnu.org/

docs/project/contributing.md

@@ -35,7 +35,7 @@ Our [Go release workflow](https://github.com/treeverse/lakeFS/blob/master/.githu
 
 1. Install the required dependencies for your OS:
    1. [Git](https://git-scm.com/downloads)
-   1. [GNU make](https://www.gnu.org/software/make) (probably best to install from your OS package manager such as [apt](https://en.wikipedia.org/wiki/APT_(software)) or [brew](https://brew.sh/))
+   1. [GNU make](https://www.gnu.org/software/make/) (probably best to install from your OS package manager such as [apt](https://en.wikipedia.org/wiki/APT_(software)) or [brew](https://brew.sh/))
    1. [Docker](https://docs.docker.com/get-docker/)
    1. [Go](https://golang.org/doc/install)
    1. [Node.js & npm](https://www.npmjs.com/get-npm)

docs/understand/architecture.md

@@ -93,7 +93,7 @@ Some data applications benefit from deeper integrations with lakeFS to support d
 ### OpenAPI Generated SDKs
 
 OpenAPI specification can be used to generate lakeFS clients for many programming languages.
-For example, the [Python lakefs-client](https://pypi.org/project/lakefs-client/) or the [Java client](https://search.maven.org/artifact/io.lakefs/api-client) are published with every new lakeFS release.
+For example, the [Python lakefs-client](https://pypi.org/project/lakefs-client/) or the [Java client](https://central.sonatype.com/artifact/io.lakefs/api-client) are published with every new lakeFS release.
 
 ### lakectl