Patch namings and URLs of chain.love

[ArseniiPetrovich]

As you may know, Glif Nodes is migrating to the new domain - Chain.Love
While all the old URLs are kept for backward compatibility purposes, it would be great to onboard new users straight to the new URLs.

On top of that - we've recently developed a widget for GitBooks that allows integration of our Toolbox feature (basically a discovery and comparison mechanism for all the service providers on the Filecoin network.

Here is the installation instructions:

1. Log into your GitBook account and go to the following link: https://app.gitbook.com/integrations/chainlove-widget
2. Add Chain.Love widget integration to the space of your docs
3. Then you have two options on how to add our widget:
   a) Through Gitbook UI - go to your docs and click on + sign to add a new section - in a section type select "Chain.Love". It will ask you for the URL.
   b) Through GitHub - in the section where you would like to include our widget add {% @chainlove-widget/chainlove-compare url="" %}
4. As URL use http://widget.docs.chain.love/?network=NETWORK. Additionally you may specify:
   a) chain param, so it will be http://widget.docs.chain.love/?network=NETWORK&chain=CHAIN, where CHAIN is either mainnet or testnet. This will allow you to limit the exact chain that can be seen through the widget. Useful, when you have a page dedicated for your testnet 😍
   b) category param, so it will be http://widget.docs.chain.love/?network=NETWORK&category=CATEGORY, where CATEGORY is one of the: rpc, indexing, oracle, devTool, explorer, analytic, wallet or faucet. Both params can be used together.

In Filecoin's case URL will be http://widget.docs.chain.love/?network=filecoin (and can contain any params described above)
I've added a few insertions of the widget in the docs (searchable through this PR via "widget" keyword), but before merging it - someone will have two execute steps 1 and 2 from the instruction above.

Additionally, made a patch there => filecoin-project/lotus-docs#824 (merged)

[ArseniiPetrovich]

@eshon, if you could tell me on which page would you like to see it - I can close #2417 for you (add https://filecoin.chain.love/eas/playground/mainnet)