Improvements for the links in the app list

[Senyoret1]

Did you run make format && make check?
The go code was not changed. npm run lint and npm run build were used.

Fixes #1097

Changes:

• A link for opening the VPN client UI was added to the app list.
• Now the link for opening the skychat app appears only if the app is running, as the UI does not work if the app is stopped.
  

How to test this PR:
Open the Skywire manager UI and go to the app list of a visor. Check the links in the list.

NOTE:
We could say that now there are 2 UIs for the VPN client, the one that is accessible with the link and the modal window that
appears when clicking on the gear button. @jdknives Maybe the modal window can be removed.

[jdknives]

@Senyoret1 I think we can remove the modal. Need to double check if there is any feature we have in it we dont have in the full UI.

[jdknives]

⠧ Generating browser application bundles (phase: building)...node:internal/crypto/hash:67
  this[kHandle] = new _Hash(algorithm, xofLen);
                  ^

Error: error:0308010C:digital envelope routines::unsupported
    at new Hash (node:internal/crypto/hash:67:19)
    at Object.createHash (node:crypto:135:10)
    at BulkUpdateDecorator.hashFactory (/home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/lib/util/createHash.js:145:18)
    at BulkUpdateDecorator.update (/home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/lib/util/createHash.js:46:50)
    at RawSource.updateHash (/home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/node_modules/webpack-sources/lib/RawSource.js:77:8)
    at NormalModule._initBuildHash (/home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/lib/NormalModule.js:880:17)
    at handleParseResult (/home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/lib/NormalModule.js:946:10)
    at /home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/lib/NormalModule.js:1040:4
    at processResult (/home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/lib/NormalModule.js:755:11)
    at /home/theodore/go/src/github.com/skycoin/skywire/static/skywire-manager-src/node_modules/webpack/lib/NormalModule.js:819:5 {
  opensslErrorStack: [ 'error:03000086:digital envelope routines::initialization error' ],
  library: 'digital envelope routines',
  reason: 'unsupported',
  code: 'ERR_OSSL_EVP_UNSUPPORTED'
}

Node.js v17.6.0
make: *** [Makefile:235: build-ui] Error 1

[Senyoret1]

The last commit includes the last changes from develop