feat: web ui 2.5.7

fix(pin): wait till after fetching to remove direct pin

Otherwise, we could abort while fetching the graph and stay in a state where the
direct pin is removed.

fixes #4650

Relevant release notes can be found on [v2.5.5](https://github.com/ipfs-shipyard/ipfs-webui/releases/tag/v2.5.5).

README: improve build documentation

fixes #6704

fixes #6704

Introduce buzhash chunker      

Pinning interop: Pin ls returns appropriate zero value

fix(resolve): correctly handle .eth domains

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

It has the same properties as Rabin but is much faster.
Benchmark results:

```
name             speed
Buzhash2/1K-4    1.71GB/s ± 4%
Buzhash2/1M-4    1.15GB/s ± 2%
Buzhash2/16M-4    892MB/s ± 1%
Buzhash2/100M-4   904MB/s ± 2%
Rabin/1K-4       13.8MB/s ± 3%
Rabin/1M-4        171MB/s ± 3%
Rabin/16M-4       182MB/s ± 4%
Rabin/100M-4      182MB/s ± 3%
Default/1K-4     1.74GB/s ± 4%
Default/1M-4     3.22GB/s ± 2%
Default/16M-4    3.88GB/s ± 2%
Default/100M-4   4.21GB/s ± 6%
```

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

This should have been handled down inside the DNSLink resolver. Otherwise, we'll
break any name happens to end in `.eth`.

also fixes #6699

Update README.md

Change first link under "Getting Started" to more specific docs per https://github.com/ipfs/go-ipfs/pull/6692#issuecomment-537110811
Ref https://github.com/ipfs/go-ipfs/pull/6692

daemon: support unix domain sockets for the API/gateway

docs: guide users to the right locations for questions

docs: readme improvements

Co-Authored-By: Eric Ronne <eric@protocol.ai>

docs: link remaining docs available, guide people to the right locations

docs: fix broken url

We no longer spit out the annoying http error.

All the work was client-side. Unix domain socket multiaddrs already worked
server-side.

fixes #4218

add systemd support

Update go-libp2p-http (and go-libp2p-gostream)

feat: add ipfs version info to prometheus metrics

Adds `ipfs_info` prometheus metric with version and commit info

```prometheus
ipfs_info{commit="9ea7c6a1-dirty",version="0.5.0-dev"} 1
```

This follows the same pattern as go and other systems, adding a gauge metric that is set to 1, with the version info addeds as labels.

This is a common pattern for prometheus. It lets operators merge version info into other prometheus metrics by multiplying it with the other stat, as described in https://www.robustperception.io/exposing-the-software-version-to-prometheus

For example, we already expose the go version info as

```prometheus
go_info{version="go1.12.9"} 1
```

License: MIT
Signed-off-by: Oli Evans <oli@tableflip.io>