Fix part of #9749: Migrate Oppia footer directive.

[ashutoshc8101]

Overview

1. This PR fixes part of Migrate directives/controllers to Angular components #9749.
2. This PR does the following: Migrate oppia footer directive.

Essential Checklist

• The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
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• The PR is made from a branch that's not called "develop".

Proof that changes are correct

oppia-footer-2021-06-07_02.38.14.mp4

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[oppiabot]

Hi, @ashutoshc8101, this pull request does not have a "CHANGELOG: ..." label as mentioned in the PR pointers. Assigning @ashutoshc8101 to add the required label. PRs without this label will not be merged. If you are unsure of which label to add, please ask the reviewers for guidance. Thanks!

[ashutoshc8101]

@srijanreddy98 Please take the first pass and assign the code owners once approved.

[oppiabot]

Hi @ashutoshc8101. Due to recent changes in the "develop" branch, this PR now has a merge conflict. Please follow this link if you need help resolving the conflict, so that the PR can be merged. Thanks!

[oppiabot]

Hi @ashutoshc8101. Due to recent changes in the "develop" branch, this PR now has a merge conflict. Please follow this link if you need help resolving the conflict, so that the PR can be merged. Thanks!

[srijanreddy98]

@darksun27 @DubeySandeep @jameesjohn @kevintab95 @nithusha21 @vojtechjelinek PTAL!

[oppiabot]

Unassigning @srijanreddy98 since they have already approved the PR.

[oppiabot]

Assigning @vojtechjelinek, @kevintab95, @nithusha21, @DubeySandeep, @jameesjohn, @darksun27 for code owner reviews. Thanks!

[darksun27]

LGTM!

[oppiabot]

Unassigning @darksun27 since they have already approved the PR.

[nithusha21]

LGTM for codeowner files

[oppiabot]

Unassigning @nithusha21 since they have already approved the PR.

[kevintab95]

LGTM for codeowner files. Thanks @ashutoshc8101!

[vojtechjelinek]

LGTM!

[oppiabot]

Hi @ashutoshc8101. Due to recent changes in the "develop" branch, this PR now has a merge conflict. Please follow this link if you need help resolving the conflict, so that the PR can be merged. Thanks!