The `section-index` plugin has a bug[^1] that causes the navigation bar
to display a wrong text for the **API Reference** link. There is a fix
for it, but `mkdocs-material` already provides the feature natively[^2],
so we can just use it instead, as it is much less likely to have issues.

[^1]: oprypin/mkdocs-section-index#18
[^2]: https://squidfunk.github.io/mkdocs-material/setup/setting-up-navigation/#section-index-pages

Signed-off-by: Leandro Lucarella <[email protected]>

Signed-off-by: Leandro Lucarella <[email protected]>

The `section-index` plugin has a bug[^1] that causes the navigation bar
to display a wrong text for the **API Reference** link. There is a fix
for it, but `mkdocs-material` already provides the feature natively[^2],
so we can just use it instead, as it is much less likely to have issues.

[^1]: oprypin/mkdocs-section-index#18
[^2]:
https://squidfunk.github.io/mkdocs-material/setup/setting-up-navigation/#section-index-pages
Fixes frequenz-floss#640.

All grid meters have to be summed for this formula but in the current
implemantation there was minus pushed to the operator stack. In this
commit the sign error has been corrected.

Signed-off-by: Matthias Wende <[email protected]>

This adds a tests with two grid meters.

Signed-off-by: Matthias Wende <[email protected]>

Signed-off-by: Matthias Wende <[email protected]>

* tag 'v0.25.1':
  Update release notes
  Add test for consumer power formula
  Fix consumer power formula
  Prepare release notes for the release
  Replace the `section-index` plugin with `navigation.indexes`
  Clear release notes