Fix #2013, add images to the repo (#5438)

* add img for health.md

* add imgs for metrics.md

* add imgs for email.md

* add img for developers.md

* add imgs for grafana/readme.md

---------

Co-authored-by: Etan Kissling <etan@status.im>

docs/the_nimbus_book/src/developers.md

@@ -217,7 +217,7 @@ USE_MULTITAIL="yes" make local-testnet-minimal
 
 You’ll get something like this (click for full size):
 
-[![](https://i.imgur.com/Pc99VDO.png)](https://i.imgur.com/Pc99VDO.png)
+[![](./img/developers_01.png)](./img/developers_01.png)
 
 
 You can find out more about the beacon node simulation [here](https://our.status.im/nimbus-development-update-03/#beaconsimulation).

docs/the_nimbus_book/src/email-notifications.md

@@ -8,17 +8,17 @@ You can create an account on [beaconcha.in](https://beaconcha.in/) to set up ema
 
 ### 1. Sign up at [beaconcha.in/register](https://beaconcha.in/register)
 
-### 2. Type your validator's public key into the searchbar
+### 2. Type your validator's public key into the search bar
 
-![](https://i.imgur.com/jHjkySK.png)
+![](./img/email_01.png)
 
 ### 3. Click on the bookmark icon
 
-![](https://i.imgur.com/O7zgE0k.png)
+![](./img/email_02.png)
 
 ### 4. Tick the boxes and select *Add To Watchlist*
 
-![](https://i.imgur.com/7ff4Ta7.png)
+![](./img/email_03.png)
 
 
 

docs/the_nimbus_book/src/health.md

@@ -13,7 +13,7 @@ As long as your validator is within the allowed inclusion distance, you will get
 
 You can verify your validator's effectiveness on the [beaconcha.in](https://beaconcha.in/) website.
 
-![](https://i.imgur.com/u80Ub2j.png)
+![](./img/health.png)
 
 Ideally you want to see a value above 95%.
 

docs/the_nimbus_book/src/metrics-pretty-pictures.md

@@ -124,7 +124,7 @@ Follow [the instructions for your platform](https://grafana.com/docs/grafana/lat
 Go to [http://localhost:3000/](http://localhost:3000/), you should see a Grafana login screen that looks like this:
 
 
-![](https://i.imgur.com/jcP1qWl.png)
+![](./img/metrics_01.png)
 
 Type in `admin` for both the username and password.
 You'll be asked to change the password (and we recommend you do so).
@@ -134,48 +134,48 @@ You'll be asked to change the password (and we recommend you do so).
 
 Hover your mouse over the gear icon in the left menu bar, and click on the `Data Sources` option in the sub-menu that pops up.
 
-![](https://i.imgur.com/0Xsgx61.png)
+![](./img/metrics_02.png)
 
 Now click on the `Add Data Source` button in the center of the screen
 
-![](https://i.imgur.com/YRVJjdD.png)
+![](./img/metrics_03.png)
 
 Select `Prometheus`
 
-![](https://i.imgur.com/YpwThOr.png)
+![](./img/metrics_04.png)
 
 Enter `http://localhost:9090` in the URL field
 
-![](https://i.imgur.com/PtVOnur.png)
+![](./img/metrics_05.png)
 
 Set the "Scrape interval" field to the same value you used in the Prometheus config ("15s" in our example below).
 
 Scroll to the bottom and click on `Save and Test`
 
-![](https://i.imgur.com/GJVdwaK.png)
+![](./img/metrics_06.png)
 
 If everything is working correctly you should see a green `Data source is working` box pop up
 
-![](https://i.imgur.com/vf5ahNA.png)
+![](./img/metrics_07.png)
 
 
 #### 8. Import a dashboard
 
 Now, let's import a dashboard; hover your mouse over the `+` icon in the left menu bar and select `import` from the pop-up menu
 
-![](https://i.imgur.com/WnnAcUR.png)
+![](./img/metrics_08.png)
 
 Click on `Upload JSON file`
 
-![](https://i.imgur.com/l65ICZ2.png)
+![](./img/metrics_09.png)
 
 Select the `beacon_nodes_Grafana_dashboard.json`  from the `nimbus-eth2/grafana/` folder and click on `Import`
 
-![](https://i.imgur.com/SoU5Isz.png)
+![](./img/metrics_10.png)
 
 You'll be directed to the dashboard where you'll be able to gain insights into the performance of `nimbus-eth2` and your validators
 
-![](https://i.imgur.com/aIfJ1iT.png)
+![](./img/metrics_11.png)
 
 !!! note
     The dashboard is very much a work in progress.
@@ -190,7 +190,7 @@ And voilà! That's all there is to it :)
 
 ### Joe Clapis
 
-![](https://i.imgur.com/05eJeBr.png)
+![](./img/metrics_12.png)
 
 Joe — who’s done some brilliant work [integrating Nimbus with Rocket Pool](https://our.status.im/rocket-pool-integration/) — has created a [wonderful guide](https://github.com/jclapis/rp-pi-guide/blob/main/Grafana.md) where he takes you through how to set up a Grafana server on your Pi, using his dashboard as an example.
 
@@ -203,7 +203,7 @@ Whether or not you're running a Pi, we recommend you check out [his guide]( http
 
 ### Metanull
 
-![](https://i.imgur.com/OlvNGlq.jpg)
+![](./img/metrics_13.png)
 
 A dashboard aimed primarily at users rather than developers.
 

grafana/README.md

@@ -19,10 +19,10 @@ In order to use it locally, you would have to make some changes:
 
 Click the small "share" icon on the top-left of the Grafana dashboard:
 
-![share icon](https://i.imgur.com/ds3BJoj.png)
+![share icon](./img/grafana_01.png)
 
 Go to the "Export" tab and enable "Export for sharing externally":
 
-![export tab](https://i.imgur.com/sxgrThb.png)
+![export tab](./img/grafana_02.png)
 
 Now you can either "Save to file" or "View JSON" and copy/paste into the destination file, whichever is faster for you.